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General Q&A about all branches of theoretical and applied mathematics, including closely-adjacent sciences where the central question is about the math.

340 posts   RSS
Activity Age Score Random
Filters (None)
50%
+0 −0
Probability of students given there are groups

0 answers  ·  posted 3y ago by Pranav_M99‭  ·  edited 2y ago by Peter Taylor‭

probability statistics
50%
+0 −0
Second mean value theorem proof (differentiation)

0 answers  ·  posted 3y ago by deleted user  ·  edited 3y ago by deleted user

calculus real-analysis differentiation
83%
+8 −0
Are there useful topologies on Cartesian products “in between” the product topology and the box topology?

0 answers  ·  posted 3y ago by celtschk‭  ·  edited 3y ago by celtschk‭

topology
33%
+0 −2
Why's the true positive rate termed Sensitivity and true negative rate Specificity, not vice versa? [closed]

0 answers  ·  posted 3y ago by DNB‭  ·  closed 2y ago by Peter Taylor‭

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

0 answers  ·  posted 3y ago by Mithrandir24601‭  ·  last activity 3y ago by r~~‭

statistics correlation
28%
+0 −3
In the Lost Boarding Pass Probability Problem, why couldn't Passengers 2-99 sit in Seats 1 or 100, before Passenger 100 boards?

0 answers  ·  posted 3y ago by DNB‭  ·  edited 3y ago by DNB‭

probability
33%
+0 −2
If k = 1, why $n(n-1) \dots \color{red}{(n-k+1)} = n$?

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

probability
50%
+1 −1
Why $\color{red}{k\dbinom{k}{1}} \neq$ "first choose the k team members and then choose one of time to be captain"?

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

probability
50%
+0 −0
How does $\lim\limits_{n \to \infty} \dfrac{p[s + (1 - s)c^n]}{p[ s + (1 - s)c^n] + (1 - p)[s + (1 - s)w^n]} = p?$

1 answer  ·  posted 3y ago by DNB‭  ·  last activity 3y ago by r~~‭

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

2 answers  ·  posted 3y ago by msh210‭  ·  last activity 3y ago by DonielF‭

euclidean-geometry high-school-mathematics
66%
+2 −0
$\sum_{k=0}^{n} \binom{n}{k}=2^{n} \overset{?}{\iff} \sum_{k=0}^{n} \binom{2n+1}{k}=2^{2n}$

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

combinatorics
18%
+0 −7
Why is -1 needed to get 65,535 from a 2^16 binary power calculation?

1 answer  ·  posted 3y ago by deleted user  ·  last activity 3y ago by Canina‭

computability power binary
57%
+2 −1
Equation of a line given some parametrized points on it and an area

1 answer  ·  posted 3y ago by msh210‭  ·  last activity 3y ago by msh210‭

high-school-mathematics coordinate-geometry
37%
+1 −3
How can I generalize a picture for the Mean Value Theorem to the Generalized MVT?

1 answer  ·  posted 3y ago by TextKit‭  ·  edited 3y ago by TextKit‭

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

1 answer  ·  posted 3y ago by Peter Taylor‭  ·  last activity 3y ago by Derek Elkins‭

number-theory
75%
+4 −0
Given a triangle with squares on two sides, the line segments joining the centres of the squares to the midpoint of the third side are equal and perpendicular

1 answer  ·  posted 3y ago by The Amplitwist‭  ·  edited 3y ago by ArtOfCode‭

geometry complex-analysis
75%
+4 −0
Can we constructively find a third element of a set $X$ satisfying $X \cong X \times X$ given two distinct elements?

0 answers  ·  posted 3y ago by Derek Elkins‭

constructive-logic type-theory
71%
+3 −0
Cutting the square

0 answers  ·  posted 3y ago by Grove‭  ·  edited 3y ago by Grove‭

geometry
75%
+4 −0
Product of empty set of elements vs. product over empty indexing set — is there any difference?

1 answer  ·  posted 3y ago by The Amplitwist‭  ·  edited 1y ago by Peter Taylor‭

product definition notation algebra
80%
+6 −0
Discrete data: Graphs and skewness

2 answers  ·  posted 3y ago by Nezar ‭  ·  last activity 3y ago by 1muflon1‭

skewness statistics discrete-data
40%
+2 −4
Why does “unless” mean “if not”?

2 answers  ·  posted 3y ago by PSTH‭  ·  edited 3y ago by Peter Taylor‭

logic
30%
+1 −5
In "if and only if" proofs, why's 1 direction easier to prove than the other?

2 answers  ·  posted 3y ago by Chgg Clou‭  ·  last activity 2y ago by Prime Mover‭

logic
66%
+2 −0
How to visualize division as splitting Dividend into B equal “partial groups”, then rounding up A partial groups to get a full group?

1 answer  ·  posted 3y ago by Chgg Clou‭  ·  last activity 3y ago by leovt‭

visualization
66%
+2 −0
In a SARIMA model, does the order in which I difference the time series matter?

0 answers  ·  posted 3y ago by anoldmaninthesea‭

statistics
42%
+1 −2
How can I visualize $\lim\limits_{x \rightarrow \pm \infty} f(x) = \lim\limits_{t \rightarrow 0^{\pm}} f(1/t)$?

1 answer  ·  posted 3y ago by TextKit‭  ·  last activity 3y ago by thelast19digitsofpi‭

visualization
71%
+3 −0
Why does this definition of generalized forces work?

1 answer  ·  posted 3y ago by Technically Natural‭  ·  last activity 3y ago by Derek Elkins‭

differential-geometry lagrangian-mechanics classical-mechanics physics
77%
+5 −0
Can we adapt Furstenberg's proof of the infinitude of primes to other interesting subsets of the integers?

0 answers  ·  posted 3y ago by HDE 226868‭  ·  edited 3y ago by msh210‭

number-theory topology
80%
+6 −0
Why always rationalize a denominator?

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

high-school-mathematics
28%
+0 −3
If a repair on a vessel costs $2$ and fully repaired vessel is worth $1$, don't we need know worth of broken vessel to decide whether to repair?

0 answers  ·  posted 3y ago by Chgg Clou‭  ·  edited 2y ago by Wolgwang‭

basic
57%
+2 −1
If $n = xm$ and $n \rightarrow \infty$, then $m \rightarrow \infty$?

1 answer  ·  posted 3y ago by TextKit‭  ·  last activity 3y ago by The Amplitwist‭

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

0 answers  ·  posted 3y ago by Razetime‭  ·  edited 3y ago by Razetime‭

geometry polygon area
50%
+2 −2
What story and one-digit Natural Numbers explain Bayes' Theorem chart most simply?

0 answers  ·  posted 3y ago by DNB‭  ·  edited 3y ago by Moshi‭

probability
88%
+14 −0
Why does the decimal expansion of $1/(10n - 1)$ have this neat pattern?

3 answers  ·  posted 3y ago by The Amplitwist‭  ·  last activity 3y ago by celtschk‭

number-theory high-school-mathematics
62%
+3 −1
Why should a non-commutative operation even be called "multiplication"?

2 answers  ·  posted 3y ago by theabbie‭  ·  last activity 3y ago by celtschk‭

definition notation abstract-algebra
66%
+2 −0
How can I deduce which operation removes redundacies?

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

probability
40%
+0 −1
Existence of a set of all sets

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

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

1 answer  ·  posted 3y ago by tommi‭  ·  last activity 3y ago by Peter Cooper Jr.‭

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

1 answer  ·  posted 3y ago by HDE 226868‭  ·  last activity 2y ago by HDE 226868‭

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

1 answer  ·  posted 3y ago by Guilherme Costa‭  ·  last activity 3y ago by Stephan Kolassa‭

forecast
71%
+3 −0
Including Association Analysis results into existing Classification Model

0 answers  ·  posted 3y ago by Guilherme Costa‭

classification association-rules
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