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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.

Filters (None)
25%
+0 −4
What are the Peano axioms?

1 answer  ·  posted 1mo ago by Julius H.‭  ·  last activity 9d ago by rmf‭

66%
+2 −0
28%
+0 −3
40%
+0 −1
66%
+2 −0
matrix inverse of $I + A$ where $A$ is skew-symmetric

1 answer  ·  posted 29d ago by Trevor‭  ·  last activity 26d ago by Trevor‭

28%
+0 −3
What is a dual object? [closed]

0 answers  ·  posted 30d ago by Julius H.‭  ·  closed 29d ago by Peter Taylor‭

44%
+2 −3
Cyclical or “loop” fractals?

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

66%
+2 −0
37%
+1 −3
66%
+2 −0
The derivatives of a function at a boundary point

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

57%
+2 −1
60%
+1 −0
Using convexity in the proof of Hölder’s inequality

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

60%
+1 −0
60%
+1 −0
71%
+3 −0
Is there a $(n_3)$ configuration which is not self-dual?

1 answer  ·  posted 3mo ago by WheatWizard‭  ·  last activity 2mo ago by Peter Taylor‭

66%
+2 −0
80%
+6 −0
What is special about the 11-cell and 57-cell?

1 answer  ·  posted 9mo ago by WheatWizard‭  ·  last activity 4mo ago by ziggurism‭

75%
+4 −0
70%
+5 −1
77%
+5 −0
Notation for one-sided hypothesis testing

1 answer  ·  posted 2y ago by tommi‭  ·  last activity 7mo ago by Glen_b‭

42%
+1 −2
Picture proof for expansion of $x^n−y^n$

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

71%
+3 −0