Elliot Lipnowski

@elliotlip.bsky.social

To be specific, in the Dawes, Tomes, Mousely, Grubbs Fidelity Fiduciary Bank. http://elliotlipnowski.com/

#mathsky notation question. We feel totally comfortable with a decoration being a function (e.g., for a number x, let \bar{x}:=x^2). But what about a case/font/format change as a function (e.g., for a number x, let \mathbf{x} denote the constant function on [0,1] taking value x)?

Spotify account gives a budget of audiobook hours before needing to pay for more hours, but if you listen to a 10-hour book at double-speed (so 5 listening hours), it counts as 10 hours of your budget. So they price r-speed listening at exactly r times that of unit-speed listening.

Fun, imprecise #mathsky question: Give a "nice" characterization of which subsets X of [0,1] are complete lattices. [Note, this is harder than the question of which X are complete *sub*lattices, and is much harder than the question of which X are lattices.]

A tiny #mathsky note on conditional expectations. I'd previously seen two standard existence results of different strengths: a) For square-integrable RVs (L2) via a super easy Hilbert space argument. b) For integral RVs (L1, a bigger class) via Radon-Nikodym—harder! But (a) can actually prove (b)!

Wanted: a program that will read me a mathematical paper in audio. Obviously best if it’s smart about (e.g.) when the symbol “X” should be pronounced “ex” and when it should be pronounced “big ex”. Has anyone in our brave new LLM world made this?

Whether it’s Barack Obama wearing a tan suit to a press conference or Donald Trump running a multi-billion dollar crypto scam from the White House, both men tested the limits of presidential propriety.

Weird phenomenon when working in applied mathematical fields: just learning that an object has a NAME is already a nontrivial advance. The reason is that various objects happen to show up in our one-off papers, but then having a name can mean some math nerds have developed a general theory of it.