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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.

367 posts RSS
Activity Age Score Random
Filters (None)
71%
+3 −0
how to mathematically express a relationship in which a vector can be any 3D unit vector

2 answers  ·  posted 1y ago by Trevor‭  ·  last activity 1y ago by trichoplax‭

notation vector
81%
+7 −0
Prove that 49 is the only prime square to be followed by twice a prime square and then a semiprime

1 answer  ·  posted 2y ago by Peter Taylor‭  ·  last activity 1y ago by Servaes‭

number-theory integer-sequences
60%
+1 −0
Considering the "type" $\Pi x:A.\Pi y:B(x).Type$

1 answer  ·  posted 1y ago by user205‭  ·  last activity 1y ago by Dan Doel‭

type-theory logic
71%
+3 −0
Average distance from circle's center to a point

1 answer  ·  posted 1y ago by TheCodidacter, or rather ACodidacter‭  ·  last activity 1y ago by TheCodidacter, or rather ACodidacter‭

geometry calculus
44%
+2 −3
How to compare lotteries, when one has highest probability of winning the jackpot, but another the highest Expected Value?

1 answer  ·  posted 1y ago by Chgg Clou‭  ·  last activity 1y ago by tommi‭

lottery
71%
+3 −0
Closed-form expression for sum of Modulo Arithmetic Progression

1 answer  ·  posted 1y ago by theabbie‭  ·  edited 1y ago by trichoplax‭

formula summation sequence modular-arithmetic
77%
+5 −0
Finding a single row of Matrix after exponentiation

1 answer  ·  posted 1y ago by theabbie‭  ·  edited 1y ago by trichoplax‭

exponent algorithm matrices
28%
+0 −3
Which other Real Analysis textbooks unusually recommend ending delta-epsilon proofs with a cluttered, bedecked $\epsilon$? [closed]

0 answers  ·  posted 1y ago by TextKit‭  ·  closed 1y ago by Mithical‭

real-analysis
33%
+0 −2
2 construals "of 100 patients presenting with a lump like the claimant’s in Gregg v Scott, 42 will be ‘cured’ if they are treated immediately."

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

statistics
22%
+0 −5
How to intuit that if you destroy someone else's lottery ticket, you didn't deprive her of a chance of winning the lottery?

0 answers  ·  posted 1y ago by DNB‭  ·  edited 1y ago by DNB‭

lottery
50%
+0 −0
Universal property of quotient spaces

2 answers  ·  posted 2y ago by Snoopy‭  ·  last activity 1y ago by ronno‭

topology
42%
+1 −2
How to intuit P(win the same lottery twice) $= p^{2}$ vs. P(win the same lottery twice | you won the lottery once) $= p$?

2 answers  ·  posted 1y ago by Chgg Clou‭  ·  edited 1y ago by Chgg Clou‭

lottery
33%
+1 −4
What's mathematically fallacious with Edvin Hiltner's Lotterycodex patterns, to maximize your chance of winning lotteries? [closed]

0 answers  ·  posted 1y ago by Chgg Clou‭  ·  closed 1y ago by Mithical‭

lottery
60%
+1 −0
Defining the two universes from Calculus of Constructions in LF

0 answers  ·  posted 1y ago by user205‭  ·  edited 1y ago by user205‭

type-theory logic
66%
+2 −0
On Tarski-style universes in type theory

1 answer  ·  posted 1y ago by user205‭  ·  last activity 1y ago by Derek Elkins‭

type-theory logic
66%
+2 −0
The purpose of logical frameworks in specifying type theories

1 answer  ·  posted 1y ago by user205‭  ·  last activity 1y ago by Derek Elkins‭

type-theory logic
28%
+0 −3
How do I compare lotteries' chances of winning jackpot, when they differ in the maximum number of plays?

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

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

0 answers  ·  posted 1y ago by Chgg Clou‭  ·  closed 1y ago by Peter Taylor‭

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

0 answers  ·  posted 1y ago by Chgg Clou‭  ·  closed 1y ago by Peter Taylor‭

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

2 answers  ·  posted 1y ago by tommi‭  ·  last activity 1y ago by Derek Elkins‭

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

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

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

0 answers  ·  posted 2y ago by tommi‭

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

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

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

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

category-theory
71%
+3 −0
Criterion in terms of the bases for determining whether one topology is finer than another

1 answer  ·  posted 2y ago by Snoopy‭  ·  last activity 2y ago by celtschk‭

topology
54%
+4 −3
Is it worth it to replace Arabic numerals with Kaktovik numerals?

1 answer  ·  posted 2y ago by GoldenGold‭  ·  last activity 2y ago by DavidCary‭

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

1 answer  ·  posted 2y ago by brah‭  ·  last activity 2y 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 2y ago by siric‭  ·  edited 2y 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 2y ago by Grove‭  ·  edited 2y 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 2y 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 2y 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 2y ago by TextKit‭  ·  edited 2y ago by trichoplax‭

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

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

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

1 answer  ·  posted 2y ago by Anonymous‭  ·  last activity 2y 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 2y ago by James McLellan‭  ·  last activity 2y 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 2y ago by beloh‭  ·  edited 2y ago by beloh‭

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

1 answer  ·  posted 2y ago by Yair Rand‭  ·  last activity 2y ago by Peter Taylor‭

geometry
71%
+3 −0
Finding the limit $ \lim_{x\to 0^+}e^{1/x}\sum_{n=\lfloor 1/x\rfloor}^\infty\frac{x^n}{n} $

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

real-analysis limits
71%
+3 −0
Given two angles of a triangle, finding an angle formed by a median

1 answer  ·  posted 2y ago by Snoopy‭  ·  last activity 2y ago by Tim Pederick‭

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

1 answer  ·  posted 2y ago by celtschk‭  ·  last activity 2y 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 2y ago by sepiabrown‭  ·  last activity 2y 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 2y ago by Chgg Clou‭  ·  last activity 2y ago by Snoopy‭

arithmetical-hierarchy
80%
+6 −0
Does there exist a non-zero game such that the sum of three or more copies of it is zero?

0 answers  ·  posted 2y ago by celtschk‭

combinatorial-game-theory
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 2y ago by Snoopy‭  ·  last activity 2y ago by Snoopy‭

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

2 answers  ·  posted 2y ago by re89j‭  ·  last activity 2y 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 3y ago by DNB‭  ·  edited 2y 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 4y ago by The Amplitwist‭  ·  edited 2y ago by Peter Taylor‭

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

1 answer  ·  posted 2y ago by msh210‭  ·  edited 2y 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 2y ago by Carefree Explorer‭  ·  edited 2y 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 2y ago by Snoopy‭  ·  last activity 2y ago by Snoopy‭

number-theory algebra
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