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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.

445 posts RSS
Activity Age Score Random
Filters (None)
40%
+0 −1
Notation for Euclidean Norm

1 answer  ·  posted 5y ago by Guilherme Costa‭  ·  last activity 5y ago by tommi‭

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

1 answer  ·  posted 5y ago by kreijstal‭  ·  last activity 5y ago by Derek Elkins‭

complex-analysis
60%
+1 −0
proving relative lengths on a secant

1 answer  ·  posted 5y ago by msh210‭  ·  last activity 5y ago by Peter Taylor‭

euclidean-geometry
57%
+2 −1
difference between quotient rule and product rule

3 answers  ·  posted 5y ago by deleted user  ·  last activity 5y ago by msh210‭

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

1 answer  ·  posted 5y ago by deleted user  ·  last activity 5y ago by Canina‭

computability power binary
77%
+5 −0
Is this topology basis dependent?

1 answer  ·  posted 5y ago by celtschk‭  ·  last activity 5y ago by Incnis Mrsi‭

topology linear-algebra topological-vector-spaces
75%
+4 −0
Intuitively, why's X% of Y = Y% of X?

1 answer  ·  posted 5y ago by Chgg Clou‭  ·  last activity 5y ago by celtschk‭

percentage
66%
+2 −0
Why aren't $z_1=f(xy)$ and $z_2=f(x/y)$ functions of 2 variables?

1 answer  ·  posted 5y ago by TextKit‭  ·  last activity 5y ago by celtschk‭

calculus
50%
+2 −2
What kind of logic does “Logic in the Theory and Practice of Lawmaking” employ?

0 answers  ·  posted 5y ago by Chgg Clou‭

logic
44%
+2 −3
Approximation of an elliptic integral

0 answers  ·  posted 5y ago by theabbie‭

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

1 answer  ·  posted 5y ago by TextKit‭  ·  last activity 5y ago by The Amplitwist‭

calculus
80%
+6 −0
Does every divergence-free vector field arise as the curl of some vector field?

1 answer  ·  posted 5y ago by The Amplitwist‭  ·  last activity 5y ago by Derek Elkins‭

geometry multivariable-calculus derivatives
50%
+0 −0
How can I visualize this Compound Interest Chart with indefinite integrals?

1 answer  ·  posted 5y ago by Chgg Clou‭  ·  last activity 5y ago by r~~‭

visualization
50%
+0 −0
How can I visualize dividing by a fraction as partial and full groups?

0 answers  ·  posted 5y ago by Chgg Clou‭

visualization
62%
+3 −1
Why should a non-commutative operation even be called "multiplication"?

2 answers  ·  posted 5y ago by theabbie‭  ·  last activity 5y ago by celtschk‭

definition notation abstract-algebra
37%
+1 −3
How can I generalize a picture for the Mean Value Theorem to the Generalized MVT?

1 answer  ·  posted 5y ago by TextKit‭  ·  edited 5y ago by TextKit‭

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

0 answers  ·  posted 5y ago by anoldmaninthesea‭

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

0 answers  ·  posted 5y ago by DNB‭  ·  edited 5y ago by Moshi‭

probability
84%
+9 −0
Classification of topological points

1 answer  ·  posted 6y ago by celtschk‭  ·  last activity 5y ago by Technically Natural‭

topology
71%
+3 −0
Isn't it wrong to write that Indefinite Integral = Definite Integral with a variable in its Upper Limit?

2 answers  ·  posted 5y ago by TextKit‭  ·  edited 5y ago by The Amplitwist‭

calculus
71%
+3 −0
Cutting the square

0 answers  ·  posted 6y ago by Grove‭  ·  edited 5y ago by Grove‭

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

1 answer  ·  posted 5y ago by Technically Natural‭  ·  last activity 5y ago by Derek Elkins‭

differential-geometry lagrangian-mechanics classical-mechanics physics
80%
+6 −0
What surface do I get by attaching $g$ handles as well as $k$ crosscaps to a sphere?

1 answer  ·  posted 5y ago by The Amplitwist‭  ·  last activity 5y ago by msh210‭

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

1 answer  ·  posted 6y ago by anoldmaninthesea‭  ·  last activity 5y ago by gramps‭

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

3 answers  ·  posted 5y ago by dustytrash‭  ·  last activity 5y ago by Grove‭

logic basic odds
77%
+5 −0
Normal in one base and not in another?

0 answers  ·  posted 5y ago by Grove‭

number-theory normal bases
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 5y ago by The Amplitwist‭  ·  edited 5y ago by ArtOfCode‭

geometry complex-analysis
80%
+6 −0
Why always rationalize a denominator?

3 answers  ·  posted 5y ago by msh210‭  ·  last activity 5y ago by Derek Elkins‭

high-school-mathematics
44%
+2 −3
Intuitively, what does the 1 mean in $\dfrac{a}{b} = \dfrac{1}{\frac{b}{a}}$?

2 answers  ·  posted 6y ago by Chgg Clou‭  ·  last activity 6y ago by nalply‭

intuition
66%
+2 −0
Disentangling Machine Learning Theory with Cross-Validation

0 answers  ·  posted 6y ago by seth.wagenman‭

model
90%
+16 −0
Why does the decimal expansion of $1/(10n - 1)$ have this neat pattern?

3 answers  ·  posted 6y ago by The Amplitwist‭  ·  last activity 6y ago by celtschk‭

number-theory high-school-mathematics
75%
+4 −0
Proving the Equation of the Pencil of Two Intersecting Circles

1 answer  ·  posted 6y ago by TripleFault‭  ·  last activity 6y ago by msh210‭

high-school-mathematics pencil conics proof circle
80%
+6 −0
The probability distribution of rolling $n$ dice and keeping $k$ highest

1 answer  ·  posted 6y ago by tommi‭  ·  last activity 6y ago by Peter Cooper Jr.‭

probability dice
57%
+2 −1
Equation of a line given some parametrized points on it and an area

1 answer  ·  posted 6y ago by msh210‭  ·  last activity 6y ago by msh210‭

high-school-mathematics coordinate-geometry
71%
+3 −0
Method to calculate the area of a cyclic n-gon

0 answers  ·  posted 6y ago by Razetime‭  ·  edited 6y ago by Razetime‭

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

1 answer  ·  posted 6y ago by Guilherme Costa‭  ·  last activity 6y ago by Stephan Kolassa‭

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

0 answers  ·  posted 6y ago by Mithrandir24601‭  ·  last activity 6y ago by r~~‭

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

2 answers  ·  posted 6y ago by Nezar ‭  ·  last activity 6y ago by 1muflon1‭

skewness statistics discrete-data
40%
+0 −1
Existence of a set of all sets

2 answers  ·  posted 6y ago by MathPhysics‭  ·  last activity 6y ago by Derek Elkins‭

set-theory
77%
+5 −0
Can we adapt Furstenberg's proof of the infinitude of primes to other interesting subsets of the integers?

0 answers  ·  posted 6y ago by HDE 226868‭  ·  edited 6y ago by msh210‭

number-theory topology
80%
+6 −0
Similar triangles with the same area

2 answers  ·  posted 6y ago by msh210‭  ·  last activity 6y ago by DonielF‭

euclidean-geometry high-school-mathematics
71%
+3 −0
Including Association Analysis results into existing Classification Model

0 answers  ·  posted 6y ago by Guilherme Costa‭

classification association-rules
71%
+3 −0
Asymptotics of counting integers by prime signature

1 answer  ·  posted 6y ago by Peter Taylor‭  ·  last activity 6y ago by Derek Elkins‭

number-theory
80%
+6 −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 6y ago by Derek Elkins‭

constructive-logic type-theory
80%
+6 −0
Computational hardness of the uniform halting problem

1 answer  ·  posted 6y ago by user53100‭  ·  last activity 6y ago by Derek Elkins‭

computability oracle-turing-machine arithmetical-hierarchy
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