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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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77%
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Complex numbers in 2D, quaternions in 4D, why nothing in 3D?

2 answers  ·  posted 2mo ago by Fred Wamsley‭  ·  last activity 5d ago by Derek Elkins‭

71%
+3 −0
Matrices with rotational symmetry

1 answer  ·  posted 13d ago by Peter Taylor‭  ·  last activity 13d ago by Peter Taylor‭

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66%
+4 −1
equilateral triangle inscribed in an ellipse

1 answer  ·  posted 2mo ago by msh210‭  ·  last activity 2mo ago by Udi Fogiel‭

71%
+3 −0
Finding distance to parabola's focus, given some points

1 answer  ·  posted 2mo ago by msh210‭  ·  last activity 2mo ago by Udi Fogiel‭

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Sample skewness consistency [closed]

0 answers  ·  posted 3mo ago by Guilherme Costa‭  ·  closed 3mo ago by Peter Taylor‭

60%
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How $ijk=\sqrt{1}$?

2 answers  ·  posted 3mo ago by deleted user  ·  last activity 3mo ago by Tim Pederick‭

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37%
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75%
+4 −0
Missing a solution: Are A and B always equal if A-B=0

3 answers  ·  posted 4mo ago by re89j‭  ·  last activity 4mo ago by tommi‭

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How's it possible to arrange 0 objects? How can 0! = 1?

3 answers  ·  posted 4mo ago by DNB‭  ·  edited 4mo ago by Quintec‭

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71%
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Are we in a "history-valley" for Topology?

2 answers  ·  posted 5mo ago by whybecause‭  ·  last activity 5mo ago by Derek Elkins‭

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50%
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Acceptable, usual to write $\ge 2$ pipes simultaneously?

1 answer  ·  posted 5mo ago by DNB‭  ·  last activity 5mo ago by Derek Elkins‭

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33%
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33%
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How do mathematicians measure area for points?

1 answer  ·  posted 6mo ago by deleted user  ·  last activity 5mo ago by zavier‭

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60%
+1 −0
What does upper indices represent?

2 answers  ·  posted 7mo ago by deleted user  ·  last activity 5mo ago by r~~‭

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+0 −0
What is the parallel for edges?

1 answer  ·  posted 6mo ago by deleted user  ·  last activity 6mo ago by r~~‭

33%
+2 −6
Can we add without using addition?

3 answers  ·  posted 7mo ago by IDoYTSoSubHaha‭  ·  last activity 6mo ago by DavidCary‭

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