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Q&A

General Q&A about all branches of theoretical and applied mathematics, including closely-adjacent sciences where the central question is about the math.

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matrix inverse of $I + A$ where $A$ is skew-symmetric

1 answer  ·  posted 1mo ago by Trevor‭  ·  last activity 1mo ago by Trevor‭

28%
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What is a dual object? [closed]

0 answers  ·  posted 1mo ago by Julius H.‭  ·  closed 1mo ago by Peter Taylor‭

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What are the Peano axioms?

1 answer  ·  posted 1mo ago by Julius H.‭  ·  last activity 19d ago by rmf‭

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Cyclical or “loop” fractals?

1 answer  ·  posted 2mo ago by Julius H.‭  ·  last activity 2mo ago by r~~‭

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The derivatives of a function at a boundary point

1 answer  ·  posted 2mo ago by tommi‭  ·  last activity 2mo ago by Snoopy‭

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Using convexity in the proof of Hölder’s inequality

1 answer  ·  posted 2mo ago by Snoopy‭  ·  last activity 2mo ago by Snoopy‭

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Is there a $(n_3)$ configuration which is not self-dual?

1 answer  ·  posted 3mo ago by WheatWizard‭  ·  last activity 3mo ago by Peter Taylor‭

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Picture proof for expansion of $x^n−y^n$

2 answers  ·  posted 7mo ago by Este‭  ·  last activity 7mo ago by Peter Taylor‭

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