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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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60%
+1 −0
How's it possible to arrange 0 objects? How can 0! = 1?

3 answers  ·  posted 2y ago by DNB‭  ·  edited 2y ago by Quintec‭

60%
+1 −0
71%
+3 −0
50%
+1 −1
50%
+1 −1
Acceptable, usual to write $\ge 2$ pipes simultaneously?

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

71%
+3 −0
33%
+0 −2
33%
+0 −2
How do mathematicians measure area for points?

1 answer  ·  posted 2y ago by deleted user  ·  last activity 2y ago by zavier‭

40%
+0 −1
60%
+1 −0
What does upper indices represent?

2 answers  ·  posted 2y ago by deleted user  ·  last activity 2y ago by r~~‭

50%
+0 −0
What is the parallel for edges?

1 answer  ·  posted 2y ago by deleted user  ·  last activity 2y ago by r~~‭

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

3 answers  ·  posted 2y ago by General Sebast1an‭  ·  last activity 2y ago by DavidCary‭

28%
+0 −3
57%
+2 −1
Third kind of infinite

1 answer  ·  posted 2y ago by Estela‭  ·  last activity 2y ago by r~~‭

28%
+0 −3
50%
+0 −0
66%
+2 −0
60%
+1 −0
What it ≡ called?

1 answer  ·  posted 2y ago by Anonymous‭  ·  last activity 2y ago by Quintec‭

40%
+0 −1
71%
+3 −0
28%
+0 −3
Why aren't the "21 possibilities here" NOT equally likely?

1 answer  ·  posted 3y ago by DNB‭  ·  edited 2y ago by Wolgwang‭