Sheehan Olver

Mathematician at Imperial College. These are my personal views and almost certainly not those of Imperial College London.

[Terrible Maps @TerribleMaps]

Mind blown.. Germany’s 5 biggest cities lie perfectly on a 4th-degree polynomial

by u/BarisSayit

[Sheehan Olver @dlfivefifty]

Made an example of rectangular collocation (a la @tobydriscoll and Nick Hale) for heat and Burger's equation using ClassicalOrthogonalPolynomials.jl+OrdinaryDiffEq.jl https://t.co/jQSVCsWcrI

[Sheehan Olver @dlfivefifty]

Fun with branch cuts!

julia> log(-(1+0im))
0.0 + 3.141592653589793im

julia> log(-(1+0.0im))
0.0 - 3.141592653589793im

[Sheehan Olver @dlfivefifty]

New preprint off the press https://t.co/iKhuvQ6HbP with my former UROP student James Chen who is now doing Part III at Cambridge. In it we introduce an effective way to compute _all_ inverses of Stieltjes transforms which come up in free probability.

[Sheehan Olver @dlfivefifty]

@monsoon0 The would probably understand “decelerating” better

[Pacific Institute for the Mathematical Sciences @pimsmath]

Dr. Sheehan Olver (@dlfivefifty) joins us for the PIMS Network Wide Colloquium on Oct 17. 🕜1:30 PM PT 📍 Online

Register ▶️ https://t.co/tXHW8v7idN

[Sheehan Olver @dlfivefifty]

Is the Inverse Symbolic Calculator broken? On https://t.co/8F18Po6JjR I looked up 0.5773502691896258 and it gave no meaningful results. The answer is 1/sqrt(3).

[Sheehan Olver @dlfivefifty]

@sp_monte_carlo @shortstein Just saw this. Checkout pathfinder which has automatic contour deformation. Or just use Mathematica’s NIntegrate which has built in support for oscillatory integrals

[Martingale Foundation @WeAreMartingale]

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[Sheehan Olver @dlfivefifty]

@acidflask @sp_monte_carlo there’s some more recent work by Alice Cortinovis and Lexing Yong that’s relevant

[Sheehan Olver @dlfivefifty]

@monsoon0 I’m currently dealing with a junk journal that I accidentally clicked “accept” instead of “reject”. There’s no option to unaccept and the email I sent was ignored… so I just have to live with countless overdue referee emails

[Sam Cohen @SamCMaths]

New College, Oxford is currently advertising for a Junior Fellow (postdoctoral level) in Mathematics

https://t.co/GwYmy1n1jn

Closes 17th Jan, come and join us!

[Sheehan Olver @dlfivefifty]

@SamCMaths By recasting it as a first order system can’t you write the solution explicitly in terms of the first column of a matrix exponential?

[Sheehan Olver @dlfivefifty]

@XenaProject Didn’t you just get a fellowship to do this? Asking Tao to do it seems like cheating … unless that was your proposal 😂

[Sheehan Olver @dlfivefifty]

@StefanKarpinski I like it in principle as it makes it easier to focus on one task. I use it occasionally, as an on/off switch. But the execution is dreadful: when you click on something that’s meant to be a pop-up window it usually hides everything you actually want to see

[Ory Schnitzer @OrySchnitzer]

Opening for a Lecturer / Senior Lecturer in Applied Mathematics at @ImperialMaths, deadline 8th Jan.

https://t.co/IlLWuqkzjo

[Sheehan Olver @dlfivefifty]

@murage_kibicho Julia never came up (and Matlab is also 1-based)

[Sheehan Olver @dlfivefifty]

A rather surreal scene from last week at Nick Trefethen’s retirement: Alan Edelman (co-creator of Julia) giving a talk with Cleve Moler (co-creator of Matlab) in front of him, facing the audience and giving his two cents

[Sheehan Olver @dlfivefifty]

@StefanKarpinski Alan’s talk was on growth rates of constants in Gaussian elimination and Cleve interjected with some historical reflections on Wilkinson. (He had also just finished his own talk during which he had not so subtly told Alan to “shut up” when asked a question by him…)

[Sheehan Olver @dlfivefifty]

You know you’re on a train to Glasgow when the coach after F is U