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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.

83%
+8 −0
Classification of topological points

1 answer  ·  posted 2y ago by celtschk‭  ·  last activity 2y ago by Ezekiel‭

83%
+8 −0
Complex numbers in 2D, quaternions in 4D, why nothing in 3D?

2 answers  ·  posted 10mo ago by Fred Wamsley‭  ·  last activity 8mo ago by Derek Elkins‭

81%
+7 −0
When and how should the $Z_n^2$ statistic be used?

1 answer  ·  posted 2y ago by HDE 226868‭  ·  last activity 1y ago by HDE 226868‭

80%
+6 −0
80%
+6 −0
Why always rationalize a denominator?

3 answers  ·  posted 2y ago by msh210‭  ·  last activity 2y ago by Derek Elkins‭

80%
+6 −0
Discrete data: Graphs and skewness

2 answers  ·  posted 2y ago by Nezar ‭  ·  last activity 2y ago by 1muflon1‭

80%
+6 −0
How to show if a set is simply connected?

1 answer  ·  posted 1y ago by kreijstal‭  ·  last activity 1y ago by Derek Elkins‭

80%
+6 −0
77%
+5 −0
Similar triangles with the same area

2 answers  ·  posted 2y ago by msh210‭  ·  last activity 2y ago by DonielF‭

77%
+5 −0
Which of the multiple definitions of correlation to use?

0 answers  ·  posted 2y ago by Mithrandir24601‭  ·  last activity 2y ago by r~~‭

75%
+4 −0
Optimising a 3 value problem (well 2 really)

1 answer  ·  posted 8mo ago by KalleMP‭  ·  last activity 8mo ago by Peter Taylor‭

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

3 answers  ·  posted 1y ago by re89j‭  ·  last activity 1y ago by tommi‭

75%
+4 −0
75%
+4 −0
Is this formula for the minimal sum correct?

1 answer  ·  posted 4mo ago by celtschk‭  ·  last activity 3mo ago by celtschk‭

75%
+4 −0
75%
+4 −0
75%
+4 −0
In $P(X\leq q)$, what do we call $q$?

1 answer  ·  posted 2y ago by anoldmaninthesea‭  ·  last activity 2y ago by gramps‭

75%
+4 −0
Using maximum of forecasted values to forecast maximum

1 answer  ·  posted 2y ago by Guilherme Costa‭  ·  last activity 2y ago by Stephan Kolassa‭

71%
+3 −0
Asymptotics of counting integers by prime signature

1 answer  ·  posted 2y ago by Peter Taylor‭  ·  last activity 2y ago by Derek Elkins‭

71%
+3 −0
Method to calculate the area of a cyclic n-gon

0 answers  ·  posted 2y ago by Razetime‭  ·  edited 2y ago by Razetime‭

71%
+3 −0
Intuitively, why's X% of Y = Y% of X?

1 answer  ·  posted 2y ago by Chgg Clou‭  ·  last activity 2y ago by celtschk‭

71%
+3 −0
Cutting the square

0 answers  ·  posted 2y ago by Grove‭  ·  edited 2y ago by Grove‭