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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.

87%
+12 −0
Why does the decimal expansion of $1/(10n - 1)$ have this neat pattern?

3 answers  ·  posted almost 2 years ago by The Amplitwist‭  ·  last activity almost 2 years ago by celtschk‭

83%
+8 −0
Classification of topological points

1 answer  ·  posted almost 2 years ago by celtschk‭  ·  last activity over 1 year ago by Ezekiel‭

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

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

81%
+7 −0
Are 3 10% chances better than one 30% chance (when penalized by a variable for failures)?

3 answers  ·  posted over 1 year ago by dustytrash‭  ·  last activity over 1 year ago by Grove‭

81%
+7 −0
Complex numbers in 2D, quaternions in 4D, why nothing in 3D?

2 answers  ·  posted 6mo ago by Fred Wamsley‭  ·  last activity 4mo ago by Derek Elkins‭

80%
+6 −0
The probability distribution of rolling $n$ dice and keeping $k$ highest

1 answer  ·  posted 2y ago by tommi‭  ·  last activity almost 2 years ago by Peter Cooper Jr.‭

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

2 answers  ·  posted almost 2 years ago by Nezar ‭  ·  last activity almost 2 years ago by 1muflon1‭

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

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

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

1 answer  ·  posted over 1 year ago by kreijstal‭  ·  last activity over 1 year ago by Derek Elkins‭

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

2 answers  ·  posted almost 2 years ago by msh210‭  ·  last activity almost 2 years ago by DonielF‭

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

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

77%
+5 −0
75%
+4 −0
Using maximum of forecasted values to forecast maximum

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

75%
+4 −0
75%
+4 −0
Proving the Equation of the Pencil of Two Intersecting Circles

1 answer  ·  posted almost 2 years ago by TripleFault‭  ·  last activity almost 2 years ago by msh210‭

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

1 answer  ·  posted almost 2 years ago by anoldmaninthesea‭  ·  last activity over 1 year ago by gramps‭

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

3 answers  ·  posted 8mo ago by re89j‭  ·  last activity 8mo ago by tommi‭

75%
+4 −0
Is this topology basis dependent?

1 answer  ·  posted over 1 year ago by celtschk‭  ·  last activity over 1 year ago by Incnis Mrsi‭

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

1 answer  ·  posted 4mo ago by KalleMP‭  ·  last activity 4mo ago by Peter Taylor‭

71%
+3 −0
71%
+3 −0
Find limits of integration in polar coordinates

2 answers  ·  posted 1y ago by MissMulan‭  ·  last activity 1y ago by r~~‭

71%
+3 −0
71%
+3 −0
71%
+3 −0
Are we in a "history-valley" for Topology?

2 answers  ·  posted 9mo ago by whybecause‭  ·  last activity 9mo ago by Derek Elkins‭

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

1 answer  ·  posted 6mo ago by msh210‭  ·  last activity 6mo ago by Udi Fogiel‭

71%
+3 −0
71%
+3 −0
organizing a library

1 answer  ·  posted 15d ago by msh210‭  ·  last activity 15d ago by celtschk‭

71%
+3 −0
Is the really only one solution?

0 answers  ·  posted 21d ago by Grove‭  ·  edited 17d ago by Grove‭

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