Dan A
@math_vet
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Mathematician and data scientist focused on fraud. Father (5yo/2yo), cyclist, former Army officer.
New York, USA
Joined November 2017
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I'm very very happy to share that our textbook is now posted online, expected to be released early August. This has been a labor of love that my wife and I have been working on for at least the past four years. We are very proud of what it has become
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I'm grading calc exams and one student couldn't remember what a saddle point was called so they went with "that thing x^3 does" accompanied with a little drawing and ya know what, that 100% displayed understanding of the material more than remembering the name.
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Well, that's it. I've taught my last class. My differential equations students applauded when I thanked them for the semester, which they really didn't have to do but brought a tear to my eye. I'm very excited for my new career but I am going to miss this.
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@Mikeachim
XKCD did a fantastic piece centered around people observing this event. It was super cool, published a frame at a time in like 30 minute increments
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I found some real life froggy friends cuddling together in the shade on a hot day.
@FrogandToadbot
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@LongFormMath
At the end of the day didn't analysis just go from 'math is just vibes' to 'MUST FORMALIZE IT ALL' to 'lol jk we were right, it's (mostly) all vibes'
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@solidangles
I like to sell it as "take a hard ODE problem and turn it into an "easy" algebraic one"
As for origins, you're doing the inner product between f and e^-st in the function space. The dot product is an inner product so it's like talking about angle
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@clhubes
Like the second day we had my baby home I was holding her and standing and my then 3 year old insisted I hold her too, so I picked her up and yelled "TWO BABIES!" Mistake.
A year later and their combined weights are like 20 extra lbs and they still want me to do "two babies"
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@PeteButtigieg
I spent most of my time in Afghanistan climbing through shipping containers or filling out packing slips for said shipping containers. I feel like less of a veteran every day because I never got shot at, and it shouldn't be that way. These arm chair generals can rot.
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@delusionalcons
To be fair, while the Pentagon budget is obscene, most of it is spent on projects lining donor pockets and the gear that gets to line units often times is under supplied, or is some fancy new contraption that is totally useless but costs more than your car.
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Just got my teaching assignments for my first semester at Manhattan. I thought I was going to teach calc I and a service course, which would have been great, but I just found out I get to teach calc III and linear algebra! Literally a dream combination of courses, I'm so excited!
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Today I accepted a job offer, so will be leaving academia after this semester! It's bittersweet but I am so excited and think this will be great for me and my family. It's a fully remote data scientist position doing consulting with with the government, which is a perfect fit.
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Home with a sick toddler and she just had a melt down over the fact that no, "my turn, teach calculus!" As she climbed up onto my chair and tried to type on my computer I was using for zoom. It was, in fact, not her turn to teach calculus.
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Apparently my wife is unhappy that I posted pics of the prime rib to FB last night b/c "no one cares" and "most people post photos of their families, not food."
Anyway, today for lunch we had prime rib grilled cheese sandwiches with onions on homemade bread and au jus
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@erfloewen
@clhubes
I can hear this thing in my soul, omg. We put it away, but just had baby number two so it's going to make a grand return in a few months.
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I'm teaching from home today with an under the weather toddler. Real conversation:
D: Are you going to let me teach calculus today?
2: yes
D: do you want to learn calculus?
2: yes *sits on my lap*
D: *pulls out book pointing to the word calculus* 'calculus!'
2: ca cu us!
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@KellyLeaWatson
I finally got a TT job. Love the school, love the students, moved my family for the job. After the first year they're eliminating the position. What are we even doing here? I'm not going to magically solve the two body problem again so that's it, I'm forced out of academia
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I've been waiting to make sure I got all the documents in, but I was very excited last month to have accepted an offer to start a tenure track position at Manhattan College next semester! After years wrecked with anxiety over our two-body problem we finally have stability.
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I just taught epsilon delta limits to my complex analysis students for the first time since they don't see it in the calc sequence here. It hit me as I was teaching it that in all likelihood it was the last time I will even teach epsilon delta limits to students in my life
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I was looking at our calc textbook and was really confused that this straight looking line was supposed to be (x+1)^2. Until I realized that it was just a function of the book being curved, lol
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@CallsignBarbie
It's not lost on me that they saw a dark skinned man in uniform and asked "what are you, a specialist or a corporal?" since it couldn't enter his brain that a young non-white male could possibly be an officer. How does "pepper spray an active duty solider" ever seem ok to him?
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@mattyglesias
The boring reason is probably because it's easier to procure since it already exists as surplus within the federal government. The real reason is probably that they think it looks cool, and they view themselves as part of the military fighting against domestic enemies, terrifying
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It was a big week. I just defended my thesis, so am Dr. A now, and earlier this week I accepted a job offer for a visiting position nearby. It's been a long year with COVID and the job market and finishing my thesis and I'm so glad that at the end of it, it all somehow worked out
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@jkass99
@sodangfancy22
I don't understand why these people want to live in a country where you need to go to war in order to deserve education without soul crushing debt. America should be better than that.
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I'm teaching R in my stats classes tomorrow. I'm super excited! I made a whole little worksheet introducing them to very basic descriptive statistics in R. Just like box plot, histogram, bar graph, mean and median, etc. Can't wait! I hope they enjoy it.
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Reflecting, it's actually been a pretty great year for me. I finished my thesis and got my PhD. I started a new job, gave a few talks, lost 30 lbs, and got way too into chess. My wife and I were also very excited that we signed a contract for our textbook this month!
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Since somehow my late night grading tweet has become semi-popular I do want to say that
1. My students have been fantastic
2. I called these saddle points a few times but didn't harp on them being called that (since that's typically more in the higher dimensional case)
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@GhostHostJustin
Are physical fitness results pubic records? Because if so...oof. I'd have tried to run a bit faster, lol
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Tomorrow is my last day teaching, maybe ever. I'm very excited for my career change and really am not going to miss commuting, but I certainly have some feelings about tomorrow being my last chance to hold a piece of chalk in front of a class
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@sunnysideadele
@rudy_betrayed
IPA is easy to brew because the large hop schedule can cover up a poorly crafted grain bill or mistakes in the mash temperature. Subtle effects occur when mashing too high or too low and depending on types of speciality grains. IPA you need two row malt and a bunch of hops
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I just had a student (one of my best) on her final take the derivative of ln(5x^3-7x) *correctly* by first factoring, and rewriting the function as ln(x)+ln(5x^2-7) THEN doing the derivative which just, is correct, but I would never think to do it that way.
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@greenleejw
@RealBobHatzes
@mstreiffer
@MillerMatthew20
@tlecaque
@AdamKinzinger
I think the only vaguely accurate thing in that tweet is that they occurred in the holy land, though they also occurred in a bunch of other places, so...
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An idea I've had for awhile is a book written for junior math majors thinking about graduate school with chapters from various mathematicians describing their research at an undergrad level and why they love it. Like an anthology almost?
Wonderful! To anyone reading this who is considering writing a math book, this shows how much people desire a new type of math book. Helpful, fun, engaging >>> terse, confusing, boring.
That’s the goal for my books. Please write books that give Prof Omar and me more competition!
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Thanks to
@mathforge
for the fantastic LaTeX code on stackexchange for drawing hyperbolic geodesics between two points. This is amazing.
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@kitbracadabra
@clhubes
sometimes they let me close my eyes, sometimes they let me hold my phone above my head. Sometimes I catch a knee to the groin while I have to save the baby from careening over my torso into a table. It's a 50/50 shot at best, but it can keep them away from my wife for a few
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@jodavis214
@clhubes
That NICU provided Palmolive soap smelled so strong too, omg. It took us like two days to start bringing our own scent free soap to the NICU otherwise the pump parts just smelled vaguely of the color green.
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Thanks to
@romanmars
and
@99piorg
I know all about the crazy story about this ubiquitous design from my youth. Worth the read!
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I doubt anyone will still be reading by this point, but if you are, thanks. I hope people know Afghanistan is a beautiful place, some parts were indistinguishable from Kansas, if not lusher. There is certainly more culture, and camels. They deserve our support and respect. (18/18
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So in calc 3 next week we're starting vector curves and line integrals, etc. I thought hey, this is very similar to dynamics, maybe I can show them how cool it is! So I got it into my head that what I should do is define a vector curve that is a dense flow on the torus. 🧵
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@GretchenTG
@SC_Griffith
Ok, that race car track with the crane on top looks awesome though. That could have been included in frame!
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I had expected to encounter these types of silly things when I left the army and came to graduate school at a very liberal Connecticut University. Like the author, I was not met with the cartoonish crying triggered students in safe spaces, but by hard working, intelligent humans
A 52-year-old Navy SEAL was accepted to Yale and expected to find “snowflakes” and “safe spaces.”
Instead he found it was the people who mock college students who are sheltered, brittle, and close-minded.
Worth a read, and consistent with my experience.
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@mattyglesias
We literally just had five cyclists die after getting run over by a truck driver high on methamphetamines, but yes, the barriers are the issue.
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We brought the new baby girl home today! My 3yo is very excited to have a baby sister and I'm excited to get away from this mosaic backsplash in the recovery room. I kept having to convince myself there couldn't possibly be a secret message encoded in the pattern, lol
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I defend my thesis in one week. The announcement was sent out a few days ago. Exciting to see this finally happening, though I'm looking forward to it being over so I can relax for a tiny bit then focus on the road ahead.
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Since I now have over 200 followers and I have all these pretty slides from my talk yesterday, I'm thinking about doing a thread about the connection between number theory and dynamics. Would this be a good use of my time? No. Would it be fun? Absolutely!
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Really enjoyed listening to
@juliemason
and
@amandamull
discussing the perception of sweat pants as"give up clothes" as I drive to pick up Thai food in sweat pants, having fished my wallet and keys out of my jeans so I wouldn't have to wear a belt for the five minute drive.
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@dr_seminnis
@BA_Friedman
I also don't think marching in formation under arms around the Capitol would be.... the best of looks.
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I have two hours to kill before my flight back to NY from Tampa and popped into their book store. I was hoping to find something I hadn't read by either Andy Weir or
@jeffvandermeer
. I grabbed The Strange Bird which is a Borne story, which I loved. Very excited!
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I just beat someone rated over 1000 on
@chesscom
for the first time! I've been plateaued around 820 for months and this week am up 140 Elo. I'm like buzzing with excitement over the possibility that I might crack 1000. I've just been focusing on going slow which is helping
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@BabyD2034
@brent_peabody
I think high housing costs has a bigger part to play than you are giving it credit for. Liberals can still be liberals in Texas but appreciate the fact that 400k can get you a McMansion instead of a 1 BR apartment.
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I graduated today. Probably the highlight of the very hot, very long day was holding my daughter afterwards, who immediately removed my tam and wore it herself. Another nice surprise was seeing one of my first students graduate. I didn't expect that I had taught anyone graduating
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@marinamaral2
I've seen these before and they're just do beautiful. How did it work again? Wasn't it something like three cameras with different filters then the negatives printed on three different colored sheets and layered? Just amazing, striking colors
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In the last few weeks I have found a number of veterans in math, all of whom, like me, thought they were alone in the field. The idea to start a website to help network veterans in mathematics started forming, so I created .
#mathtwitter
#miltwitter
MathVets is a new resource for veterans in mathematics to find and promote other veterans in the field. If you are a veteran in math or know a veteran in math, please reach out to us.
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I just got my 2.5 yr old to go to sleep before 7 pm with no tears. We just ate dinner and had a bath early then played a bit. She requested some water and a reading of goodnight moon, and wanted to hold cat in the hat rather than Mickey, but then passed right out. Please clap.
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Spotted a NYC bun this morning mid run as I cut through the park to get to campus for commencement
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@DradeeusKedi
@delusionalcons
Tanks are sexy, I've driven a tank, slept on a tank, we don't need more tanks. If anything we need components for the take we have that can't go anywhere because they're missing a lug nut or whatever
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All the military folks I follow are posting reflectively about Afghanistan because of the statements made by POTUS about a final withdrawal. I will hazard a guess that few in the math community noticed, so I figured I'd post briefly about it. (1/18)
I strongly support President Biden's commitment to withdraw all US forces from Afghanistan. It's time to bring our troops home.
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In fact I think I explicitly said something about the multivariable analog actually looking like a saddle but that they should just remember that if the derivative doesn't change signs at a critical point it may be one of these things, but it's certainly not an extrema.
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This bunny mama lives in our back yard and I've seen a few of the babies with her. It's very cute and I love seeing the backyard full of life but also they can't get to my kale because it's in a raised bed so hahaha stay out of my garden!
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@commaficionado
@FintanYTWalsh
Yeah this was designed exactly for those of who's best friend was an atlas at age ten.
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@kxlblockade
@LilbitofKrystal
@molllygurl
Yeah, assaulting a position (possibly a building) is a well defined military task. Totally something you can do.
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My wife is isolating from me and my daughter who have COVID and I'll tell you what, I think a whole weekend parenting a mostly asymptomatic and energetic toddler alone while under the weather with COVID is going to be the death of me. I just want to lay down and she's RUNNING.
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Wish me luck. Today is the day of my first toddler birthday party. We've never been invited to one of these before but my oldest girl is getting to be that age. It's 12-2.
At a trampoline park.
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Well, I got the official letter a few minutes ago. My position is terminated at the end of the academic year. I'm glad I'm already doing job applications.
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Very relieved to have submitted the final manuscript of our textbook to the publisher today! My wife and I have been working on it since 2019 and the stress relief from having it finally submitted feels just amazing.
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@mattyglesias
I think the concept of the internet evolving into a place for high minded debate between anonymous bloggers was way more believable in 1985 when the book was published than in 2013 when the movie was released.
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My kid was up screaming for an hour at 330 and woke up happy as a clam. She looked at me and said "daddy sleepy" to which I said yes, daddy is sleepy.
So she goes "daddy sleepy? Go bed, sleep!" Like yes, that would be great, but I'm already late for work love. Good idea though!
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2: eagerly flipping through the book
D: Do you like calculus?
2: YES!
Gotta get them started early I guess. She since has found the Moana DVD, opened it, and tried to insert it into the internet modem. I put it on, hopefully it keeps her happy for the next hour.
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One of the highlights of visiting family in Chicagoland: finally get to get fresh
@GiordanosPizza
deep dish!
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I feel like I should know this.
In linear I've started using 'solutions to an ODE' as examples. i.e. sint and cost form a basis for the solution space to y''+y=0. Just to get them thinking outside of the vectors box.
What does the solution space to y^(5)-y'+y=0 look like?
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I got an email from a talent acquisition person from one of the companies I applied to. It had a link for me to fill out an additional application form on their website. I'm cautiously optimistic that that means I might possibly be able to get to an interview. Fingers crossed!
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I realized that I'm losing my Matlab license, so am spending the time during my finals translating my code for my chess research project from Matlab into Python. It's kinda fun, I'm really optimizing the code, and it's reacquainting me with the project which is great!
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@wildkatphoto
@MrsMeSeeks
@LethalityJane
The shut up and row mentality is one of the most toxic mentalities that permeates the office corp. It leads to bad leaders failing to question the status quo and falling into the "well this how is always been done" pitfall. It also causes a lot of good leaders to leave.
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@LethalityJane
I'm convinced the army cultural thing of shaming people who go to sick call for something that's 'not that bad' translates into the VA saving millions of dollars when those soldiers become veterans who refuse to file for disability over 'just tinnitus' or 'just a bum shoulder'
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Got some truly, truly shitty news today. I'll say more in a few weeks probably but I'm just crushed right now. Feel unmoored, just drifting like a ship in the night.
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As I start putting together applications for TT jobs I really just wish there was a way I could say "I'm in a two body problem and my wife is tenured nearby, please please please at least let me interview!" in an appropriate and professional way but I don't think there is.
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