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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)
22%
+0 −5
If a changes to b, then doesn't a + d = b? Why a(1 + d) = b? [closed]

0 answers  ·  posted 3y ago by Chgg Clou‭  ·  closed 3y ago by Peter Taylor‭

high-school-mathematics
22%
+0 −5
Isn't Ontario 49 always worse than Daily Grand? [closed]

0 answers  ·  posted 3y ago by Chgg Clou‭  ·  closed 3y ago by Peter Taylor‭

lottery
60%
+1 −0
The meaning of $\pm$

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

notation
22%
+0 −5
At what jackpot minimum is playing Lottario rational?

1 answer  ·  posted 3y ago by Chgg Clou‭  ·  edited 3y ago by Chgg Clou‭

lottery
60%
+1 −0
Connection between caustics and conjugate points?

0 answers  ·  posted 3y ago by tommi‭

differential-geometry
66%
+2 −0
Unification and generalization of limit and colimit

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

limits category-theory
75%
+4 −0
Generalization of categorical product

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

category-theory
75%
+4 −0
Criterion in terms of the bases for determining whether one topology is finer than another

1 answer  ·  posted 3y ago by Snoopy‭  ·  last activity 3y ago by celtschk‭

topology
50%
+4 −4
Is it worth it to replace Arabic numerals with Kaktovik numerals?

1 answer  ·  posted 3y ago by GoldenGold‭  ·  last activity 3y ago by DavidCary‭

Kaktovik numerals
50%
+0 −0
Finding a quadratic that has solutions to given values

1 answer  ·  posted 3y ago by brah‭  ·  last activity 3y ago by trichoplax‭

algorithm approximation numerical-analysis
75%
+4 −0
What is the probability that the convex hull of $n$ randomly distributed points has $l$ of the points on its boundary?

1 answer  ·  posted 4y ago by siric‭  ·  edited 3y ago by tommi‭

probability convex-hull
77%
+5 −0
Is $f(x)=\sin(x)$ the unique function satisfying $f'(0)=1$ and $f^{(n)}(\Bbb R)\subset [-1,1]$ for all $n=0,1,\ldots$?

1 answer  ·  posted 4y ago by Grove‭  ·  edited 3y ago by Pavel Kocourek‭

derivatives real-analysis
60%
+1 −0
Is there a "regular" quasi-convex function $f:\Bbb R^2 \to \Bbb R$ that is not a monotone transformation of any convex function?

0 answers  ·  posted 3y ago by Pavel Kocourek‭

multivariable-calculus real-analysis convex-analysis monotone-functions
60%
+1 −0
Is there a two variable quartic polynomial with two strict local minima and no other critical point?

0 answers  ·  posted 3y ago by Pavel Kocourek‭

multivariable-calculus real-analysis maxima-minima polynomials roots
30%
+1 −5
What did James Stewart mean by "the line integral reduces to an ordinary single integral in this case" ?

2 answers  ·  posted 3y ago by TextKit‭  ·  edited 3y ago by trichoplax‭

line-integral
66%
+2 −0
Proving $|{\bf R}^{\bf R}|=|2^{\bf R}|$ using the Schroeder-Bernstein Theorem

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

set-theory
28%
+0 −3
Expanding the Integration problem.

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

integration
80%
+6 −0
What is the Name of Function for Probability of a Certain Sum on Random Die Rolls?

1 answer  ·  posted 3y ago by James McLellan‭  ·  last activity 3y ago by Derek Elkins‭

statistics
37%
+1 −3
Find all integer solutions for $a_1(a_1+k)(a_1+2k)...(a_1+(2k+1)d)+1 = n^2$ [closed]

1 answer  ·  posted 4y ago by beloh‭  ·  edited 3y ago by beloh‭

arithmetic algebra series
60%
+1 −0
Dividing a cuboid in four

1 answer  ·  posted 4y ago by Yair Rand‭  ·  last activity 3y ago by Peter Taylor‭

geometry
71%
+3 −0
Given two angles of a triangle, finding an angle formed by a median

1 answer  ·  posted 4y ago by Snoopy‭  ·  last activity 4y ago by Tim Pederick‭

euclidean-geometry vector
75%
+4 −0
Is this formula for the minimal sum correct?

1 answer  ·  posted 4y ago by celtschk‭  ·  last activity 4y ago by celtschk‭

set-theory ordinal-numbers
71%
+3 −0
Do linear and group invariant functions allowed to go inside(?) integral operators?

1 answer  ·  posted 4y ago by sepiabrown‭  ·  last activity 4y ago by r~~‭

integration geometric-deep-learning invariant-function
14%
+0 −10
How can 3/1 ≡ 1/(1/3), when left side features merely integers, but right side features a repetend?

2 answers  ·  posted 4y ago by Chgg Clou‭  ·  last activity 4y ago by Snoopy‭

arithmetical-hierarchy
77%
+5 −0
Why can't we conclude the extrema property of a function from its quadratic approximation when the discriminant is zero?

1 answer  ·  posted 4y ago by Snoopy‭  ·  last activity 4y ago by Snoopy‭

multivariable-calculus derivatives
71%
+3 −0
How to calculate remaining volume of a wire spool

2 answers  ·  posted 4y ago by re89j‭  ·  last activity 4y ago by Olin Lathrop‭

geometry volume
37%
+1 −3
What's wrong with evaluating $n(n-1) \dots (n-[k-3])(n-[k-2])\color{red}{(n-[k-1])}$ at $k = 1$?

1 answer  ·  posted 5y ago by DNB‭  ·  edited 4y ago by Peter Taylor‭

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

1 answer  ·  posted 5y ago by The Amplitwist‭  ·  edited 4y ago by Peter Taylor‭

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

1 answer  ·  posted 4y ago by msh210‭  ·  edited 4y ago by Peter Taylor‭

geometry conics
71%
+3 −0
Show that $\forall n \in \mathbb{Z}^{+}$, $25^n \equiv 25 \bmod{100}$.

2 answers  ·  posted 4y ago by Carefree Explorer‭  ·  edited 4y ago by Peter Taylor‭

number-theory recreational-mathematics modular-arithmetic
75%
+4 −0
Proving that $p\mid (p+1776)$ if $p$ is a prime and $p(p+1776)$ is a perfect square

2 answers  ·  posted 4y ago by Snoopy‭  ·  last activity 4y ago by Snoopy‭

number-theory algebra
71%
+3 −0
organizing a library

1 answer  ·  posted 4y ago by msh210‭  ·  last activity 4y ago by celtschk‭

combinatorics recreational-mathematics
77%
+5 −0
If $\mathbf{R}$ is thought of as a vector space over $\mathbf{Q}$, what is its dimension?

1 answer  ·  posted 4y ago by Snoopy‭  ·  last activity 4y ago by r~~‭

linear-algebra vector-space
33%
+0 −2
Inhomogenous differential equations in sciences

0 answers  ·  posted 4y ago by MissMulan‭  ·  edited 4y ago by MissMulan‭

calculus equation differential applied-mathematics
71%
+3 −0
Prove $e^x \ge x+1 \; \forall x \in \mathbb{R}$ using induction

1 answer  ·  posted 4y ago by Carefree Explorer‭  ·  edited 4y ago by Derek Elkins‭

limits induction inequality solution-verification
50%
+0 −0
Is there a way to encode a unique arrangement of vertices of a graph with a unique short word?

2 answers  ·  posted 4y ago by Carefree Explorer‭  ·  last activity 4y ago by celtschk‭

graph-theory
71%
+3 −0
Show that $f(x) = \arctan\left(\frac{x}{x+1}\right) + \arctan\left(\frac{x+1}{x}\right) = \frac{\pi}{2}$

2 answers  ·  posted 4y ago by Carefree Explorer‭  ·  last activity 4y ago by Derek Elkins‭

limits trigonometry
60%
+1 −0
What's the common ratio for this geometric sequence?

1 answer  ·  posted 4y ago by General Sebast1an‭  ·  last activity 4y ago by tommi‭

geometric-sequence sequence
71%
+3 −0
The gcd of powers in a gcd domain

0 answers  ·  posted 4y ago by Snoopy‭  ·  edited 4y ago by Snoopy‭

abstract-algebra
50%
+3 −3
Isn't "any, some, or all" redundant? Why not write just "any"?

1 answer  ·  posted 4y ago by Chgg Clou‭  ·  last activity 4y ago by Tim Pederick‭

terminology
50%
+0 −0
What are the 2 arithmetic means of $x + y$ and $4x - 2y$?

2 answers  ·  posted 4y ago by General Sebast1an‭  ·  last activity 4y ago by General Sebast1an‭

arithmetic sequence mean
71%
+3 −0
Notation for nested exponents

1 answer  ·  posted 4y ago by JRN‭  ·  last activity 4y ago by leovt‭

notation exponents
70%
+5 −1
equilateral triangle inscribed in an ellipse

2 answers  ·  posted 4y ago by msh210‭  ·  last activity 4y ago by Anonymous‭

conics triangle
71%
+3 −0
Do the Faber partition polynomials have integer coefficients?

1 answer  ·  posted 4y ago by Peter Taylor‭  ·  last activity 4y ago by Peter Taylor‭

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

2 answers  ·  posted 5y ago by Chgg Clou‭  ·  last activity 4y ago by Prime Mover‭

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

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

analysis formula algorithm
87%
+12 −0
Complex numbers in 2D, quaternions in 4D, why nothing in 3D?

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

quaternions
60%
+1 −0
How $ijk=\sqrt{1}$?

2 answers  ·  posted 4y ago by deleted user  ·  last activity 4y ago by Tim Pederick‭

quaternions
80%
+6 −0
$g(x)\xrightarrow{x\to\infty}\infty$ Implies $g'(x)\leq g^{1+\varepsilon}(x)$

3 answers  ·  posted 4y ago by Udi Fogiel‭  ·  last activity 4y ago by Peter Taylor‭

calculus
60%
+1 −0
Are vectrices useful for calculations as opposed to formalism?

1 answer  ·  posted 4y ago by Fred Wamsley‭  ·  last activity 4y ago by Derek Elkins‭

Vectrix Numerical
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