User Paul Castle

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About

Finished my PhD in 2014, currently doing a lot of private tutoring, working in dynamical systems and special functions.

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Yearling

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Nov 14, 2019

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Explainer

Sep 29, 2015
Excavator

Jan 8, 2018
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Dec 3, 2015

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calculus

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geometry

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ordinary-differential-equations

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probability

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Is there a non-elementary function with an elementary derivative and an elementary inverse?

Jul 31, 2018

Does the second derivative of a convex function exist at all but countably many points?

Mar 20, 2017

calculus , double integral at ellipse region

Jul 11, 2016

Possible assistance with a monstrous pair of integrals

Jul 11, 2016

Parametric equations of an ellipse in an arbitrary plane at an arbitrary orientation?

Jul 11, 2016

Differentiation of$ f^{-1}(x)$, where $f(x)=e^{x-1}+x^3-4x^{-3}+10$

Jul 24, 2016

For points A, B, does there there a billiard such that any trajectory from A will reflect twice and then reach B?

May 26, 2015

Who is "D Castro" and where did his 24 sided unilluminable room really come from?

Apr 20, 2017

Find probability of exactly one $6$ in first ten rolls of die, given two $6$s in twenty rolls

Jun 4, 2015

How to graph the intersection of two surfaces

Jun 10, 2015