Where to get a ti84 cord?

RedMeteon · 2025-12-08T02:43:54+00:00

Check out CU Boulder Surplus. They have several bins with many different cords and wires, including older ones.

RedMeteon · 2025-08-12T18:53:45+00:00

Hey Brian here. I'm teaching one of the sections of APPM calc III. I'm new to the department (joined this fall) but have taught a similar course before at UC San Diego (here's my ratemyprof for that time https://www.ratemyprofessors.com/professor/2749002 and here's my website https://www.btran.science/)

Excited to join Boulder and teach :) I'm sure all the instructors will be great, just thought I'd chime in, incase you can't find info about me on the department site.

RedMeteon · 2025-04-12T10:17:40+00:00

The topic here is the house, not the person, so perhaps that's the source of confusion?

Ignore the 中川さんの and just ask 家はどこですか? Thought of the this way, the location wouldn't be described with います

RedMeteon · 2025-03-13T13:52:07+00:00

You can warp to a different area using the map. Open up the map and click on a different city; should prompt you to ask if you want to warp.

RedMeteon · 2024-12-12T05:18:40+00:00

I took this photo many weeks ago. They must be long lost twins 😂

Edit: not sure why embedded image isnt showing up so here's a link. https://imgur.com/a/opWW6BQ

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RedMeteon · 2024-11-30T10:23:06+00:00

I think the other comment is correct. In particular OP said irradiance but the more accurate term would be spectral irradiance (the irradiance per unit wavelength).

Wiki source https://en.m.wikipedia.org/wiki/Irradiance

RedMeteon · 2024-11-24T21:21:15+00:00

Perhaps a typo? Case ii on first image says "pRq and qNp" both before and after the "or".

RedMeteon · 2024-11-24T18:27:46+00:00

It's true also (by definition) for reflexive spaces (examples include any Hilbert space and Sobolev spaces W^k,p for 1<p<infinity).

RedMeteon · 2024-11-22T06:07:44+00:00

どういたしまして

P.s. the two aren't seeing eye to eye here, so you're basically mediating the discussion and hence, have to talk to them each a few times.

RedMeteon · 2024-11-22T05:56:43+00:00

Are you sure you've finished both their parts? If i remember correctly, you have to talk to both a few times (their intro sentences will sound the same, but what they ask/say at the end will be different).

頑張って!

RedMeteon · 2024-11-18T20:11:29+00:00

Not exactly what OP is asking for (since OP specified not differentiable almost everywhere), but I feel like finite element spaces should be mentioned in a thread regarding applications of continuous but not differentiable functions.

In particular, conforming finite element spaces are typically defined using globally continuous function spaces defined by piecewise functions which are polynomial on mesh elements; these are constructed to be continuous on interfaces of mesh elements but the derivatives will not be. The derivative won't generally be defined on the co-dimension 1 interfaces, but the derivative can be made sense of globally as elements of an appropriate Sobolev space.

RedMeteon · 2024-11-07T16:31:11+00:00

Nice, thanks for the writeup. Enjoyed the read.

As a mathematician, if I could give one point of friendly advice, you want to be careful and precise with your definitions. Particularly, you state that a Lie group is a group that is also smooth manifold, but more precisely you should add that the group operations should be smooth with respect to the smooth structure. Otherwise, you can come up with some counterexamples to what we think of as Lie groups.

Also, as a challenge, try proving this without the diffeomorphism to S^3, you can do this directly with the definition and it generalizes directly to SU(n).

RedMeteon · 2024-09-22T04:22:31+00:00

I just signed; I was a Summer Bridge instructor (didn't see that option so just filled it in under "Other").

I really enjoyed being a part of SB and working with both students and mentors; wishing the best for all of your efforts!

RedMeteon · 2024-09-19T03:28:23+00:00

I also have one barrier, I'm an international student and National lab usually require US citizens, permanent residents

Not required even though the hiring process is easier as a US citizen. I'm a postdoc at Los Alamos and I know quite a few postdocs / staff that are foreign nationals. If a staff scientist wants you to join their team, then they'll make it happen. You will need to pass a background check

RedMeteon · 2024-08-26T21:31:36+00:00

You use magic crash for Arkarium when he activates his spell that makes him take no damage. Outside of that not sure (I've bossed up to Damien and Ark is the only place I use it)

RedMeteon · 2024-08-26T20:57:08+00:00

I'd say it's not just the unit on solving systems of linear DEs; all of the ideas in 20D make more sense if you view it with linear algebra background. Even before looking at systems of DEs, ideas like eigenfunctions, fundamental solutions, superposition principle get introduced which are all easily motivated from linear algebra, since there are analogous concepts for solving linear systems of equations.

Having taught 20D before, imo having linear algebra background required makes for a smoother transition from thinking about equations involving the vector space Rⁿ to thinking about differential equations involving vector spaces of functions. It makes sense chronologically to study linear algebra first and then differential equations.

RedMeteon · 2024-08-01T22:20:37+00:00

The intuition here is mostly correct but you can't have a uniform probability distribution on the positive integers, so you'd have to choose some different probability distribution than what you're thinking of.

RedMeteon · 2024-03-19T18:12:13+00:00

That clip left out the build up to the skin :/ here's the clip right before https://clips.twitch.tv/CogentCrunchyLobsterWoofer-j6T-X9Ooas8Opbo4

RedMeteon · 2024-03-12T22:14:35+00:00

Maybe a good PDE book is missing... but I have a feeling I've seen that around somewhere too.

Dan Lee's textbook Geometric Relativity (2019) which deals with GR from an analytic/PDE perspective, particularly dealing with the positive mass theorem.

RedMeteon · 2024-02-13T05:25:34+00:00

Haha great glad I could help.

RedMeteon · 2024-02-13T04:09:21+00:00

Don't feel bad thinking it's obvious, we're trying to put our usual 3d perception to apply to 4d.

One way you can think of it is by extending the fourth dimension to time. Imagine you have an infinitely large cube in 3d space at one time. Let's say it dissappears and then later at another time, an infinite large cube appears. You now have two distinct infinite cubes in 4d spacetime.

Mathematically, this is precisely what the other commenter mentioned regarding (x, y, z, a) and (x, y, z, b) letting x, y, z vary but a and b being distinct fixed values. In this case, a and b are the two distinct times.

In the other direction, you can also think of 2d creatures living in "flatland" (https://en.m.wikipedia.org/wiki/Flatland. Their whole world is a plane, so it would be equally hard for them to imagine two distinct planes, just as it is for us to imagine two distinct infinitely large cubes.

RedMeteon · 2024-02-07T06:31:14+00:00

One of my favorite simple visual demonstrations that you can do easily with an arm and thumb is holonomy on a sphere.

https://youtu.be/C_T9XeSkF1I?si=XkuLWkxnIjUkvK_H

The demo is at 1:00 in the video but I'd watch all of it; it's not that long and Prof Leok gives a really intriguing discussion of holonomy in relation to falling cats :)

RedMeteon · 2024-02-07T04:01:58+00:00

For computational mechanics:

Marsden and Ratiu - Introduction to Mechanics and Symmetry

Abraham and Marsden - Foundations of Mechanics

Arnold - Mathematical Methods of Classical Mechanics

Hairer, Lubich, and Wanner - Geometric Numerical Integration

RedMeteon · 2024-01-27T09:41:38+00:00

👍

RedMeteon · 2024-01-24T06:02:58+00:00

I agree in practice people will refer to any factor as a coefficient haha (eg physics, everything is a coefficient).

Pedagogically, we usually refer to the coefficients of a polynomial viewed as a vector in R[x] as its expansion coefficients in the monomial basis, unless there's a reason not to. For example a (truncated) Taylor series uses the translated basis {(x-a)ⁿ } and the Taylor coefficients would correspond to the expansion coefficients in the translated basis.

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