Vote summary for Derek Elkins‭

A daily summary of votes received for posts.

May 24, 2026: +1

+1

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Can we constructively find a third element of a set $X$ satisfying $X \cong X \times X$ given two distinct elements?

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May 3, 2026: +1

+1

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Does every divergence-free vector field arise as the curl of some vector field?

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Mar 26, 2026: +1

+1

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What was Justice Scalia's mathematical mistake in Penry v. Lynaugh (1989)?

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Mar 22, 2026: +1

+1

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Can we constructively find a third element of a set $X$ satisfying $X \cong X \times X$ given two distinct elements?

Question Q&A

Mar 15, 2026: +1

+1

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How can one prove Tychonoff's theorem using ultrafilters?

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Mar 3, 2026: +1

+1

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How to justify: for every integer $r$ in $[1, k-1]$, there is an integer $j$ in $[0, k-1]$, such that $r + j = k$

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Feb 28, 2026: +2

+2

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How can one prove Tychonoff's theorem using ultrafilters?

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Jan 23, 2026: +1

+1

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What explains the Inventor’s Paradox? Why can more general problems, paradoxically, be easier to solve or prove?

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Dec 20, 2025: +1

+1

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What explains the Inventor’s Paradox? Why can more general problems, paradoxically, be easier to solve or prove?

Answer Q&A

Dec 12, 2025: +2

+1

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What explains the Inventor’s Paradox? Why can more general problems, paradoxically, be easier to solve or prove?

Answer Q&A

+1

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Complex numbers in 2D, quaternions in 4D, why nothing in 3D?

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Nov 25, 2025: +1

+1

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How to justify: for every integer $r$ in $[1, k-1]$, there is an integer $j$ in $[0, k-1]$, such that $r + j = k$

Answer Q&A

Nov 15, 2025: +2

+2

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How to justify: for every integer $r$ in $[1, k-1]$, there is an integer $j$ in $[0, k-1]$, such that $r + j = k$

Answer Q&A

Jun 9, 2025: +1

+1

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How to validate if the horizontal and vertical tangent lines exist for implicit functions?

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Mar 2, 2025: +1

+1

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Complex numbers in 2D, quaternions in 4D, why nothing in 3D?

Answer Q&A

Dec 28, 2024: +1

+1

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How to validate if the horizontal and vertical tangent lines exist for implicit functions?

Answer Q&A