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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.

334 posts   RSS
Activity Age Score Random
Filters (None)
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
28%
+0 −3
Are Stars and Bars in Combinatorics related to the Fence Post Error?

0 answers  ·  posted 3y ago by DNB‭

combinatorics
40%
+0 −1
What is the meaning of integration under integral sign?

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

calculus integration
40%
+0 −1
How would you vaticinate to $-w_k$ from both sides of $w_{k + 1} = \dfrac{w_k - (1 - p)w_{k - 1}}{p}$?

1 answer  ·  posted 2y ago by DNB‭  ·  last activity 2y ago by Giannis‭

probability
75%
+4 −0
$\int_{E_n} |g|^q = \left| \int_E \chi_{E_n}\cdot \text{sgn}(g)\cdot g \cdot |g|^{q-1}\cdot |g| \right|$

0 answers  ·  posted 2y ago by whybecause‭  ·  edited 2y ago by Derek Elkins‭

real-analysis Lp-space
50%
+0 −0
If Alice must've have classes on at least 2 days, why do you need the intersection of 3 $A_i^C$'s? [closed]

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

probability
28%
+0 −3
Without calculations, how can you visualize "that half the squares are white and half are black"?

1 answer  ·  posted 3y ago by DNB‭  ·  last activity 2y ago by whybecause‭

probability
80%
+6 −0
Does this generalization of path-connectedness also cover general connectedness?

1 answer  ·  posted 3y ago by celtschk‭  ·  last activity 12mo ago by ronno‭

topology connectedness
42%
+1 −2
How to determine area of square using Calculus in Cartesian coodinate?

3 answers  ·  posted 2y ago by deleted user  ·  last activity 2y ago by celtschk‭

calculus integration
28%
+0 −3
Besides guaranteeing 0 ≤ P(A ∩ B) ≤ 1, why can't Independence be defined as P(A ∩ B) = P(A) +,-, or ÷ P(B)?

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

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

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

logic basic odds
33%
+0 −2
For (a variation) of the Monty Hall problem, what permits you to repaint doors 2 and 3? What permits you to replace p with $1 - p$?

0 answers  ·  posted 2y ago by DNB‭  ·  edited 2y ago by DNB‭

probability
42%
+1 −2
How do mathematicians measure shape perimeters?

2 answers  ·  posted 2y ago by deleted user  ·  edited 2y ago by deleted user

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

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

geometry area point border perimeter
70%
+5 −1
equilateral triangle inscribed in an ellipse

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

conics triangle
60%
+1 −0
Prove $(\cos^3\theta+\sin^3\theta)^2= \cos^6\theta(1+\tan^3\theta)^2$

2 answers  ·  posted 2y ago by deleted user  ·  last activity 2y ago by Peter Taylor‭

trigonometry
50%
+0 −0
Differentiating a series expansion of an arbitrary function

1 answer  ·  posted 3y ago by deleted user  ·  edited 3y ago by Mithrandir24601‭

calculus derivatives differentiation
81%
+7 −0
Does this construction always give a topological vector space?

0 answers  ·  posted 2y ago by celtschk‭  ·  edited 2y ago by r~~‭

topology linear-algebra topological-vector-spaces
50%
+0 −0
What was Justice Scalia's mathematical mistake in Penry v. Lynaugh (1989)?

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

probability
33%
+0 −2
De-mystifying tricks – If $\{x_n\}$ converges, then Cesaro Mean converges.

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

analysis
50%
+0 −0
Sample skewness consistency [closed]

0 answers  ·  posted 2y ago by Guilherme Costa‭  ·  closed 2y ago by Peter Taylor‭

skewness statistics
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
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 2y ago by DNB‭  ·  edited 2y ago by DNB‭

probability
33%
+0 −2
Why 1. multiply the number of independent options? 2. add the number of exclusive options?

3 answers  ·  posted 2y ago by DNB‭  ·  last activity 2y ago by Tim Pederick‭

probability
50%
+0 −0
Solve $\int_0^{\dfrac{\pi}{6}} \sec^3 \theta \mathrm d\theta$

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

calculus integration definite-integrals
50%
+0 −0
"the people who move have a percentage of Democrats which is between these two values" — How does this furnish intuition for Simpson's Paradox?

0 answers  ·  posted 2y ago by DNB‭  ·  edited 2y ago by DNB‭

probability
28%
+0 −3
After $n - 2$ unchosen doors are opened, how does the probability of the $n - 2$ unchosen doors "shift" or "transfer" to the lone unchosen door?

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

probability
50%
+0 −0
Is $x=\int \int \ddot{x}\mathrm dx \mathrm dx$?

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

multivariable-calculus
77%
+5 −0
Finding the smallest Mersenne-number multiple of an odd integer

1 answer  ·  posted 2y ago by wizzwizz4‭  ·  last activity 2y ago by Peter Taylor‭

binary mersenne-numbers algorithm factoring
33%
+0 −2
How can you foretell if a problem is one whose solution admits a simple mathematical description?

0 answers  ·  posted 3y ago by Chgg Clou‭

geometry
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
33%
+0 −2
Why's the unique sub-game perfect equilibrium, that the first player should offer around $1.25 to player 2?

0 answers  ·  posted 3y ago by Chgg Clou‭

game-theory
28%
+0 −3
How can Cross Multiplication be intuited or pictured? [closed]

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

arithmetic
75%
+4 −0
Missing a solution: Are A and B always equal if A-B=0

3 answers  ·  posted 2y ago by re89j‭  ·  last activity 2y ago by tommi‭

logic equation algebra problem
60%
+1 −0
Find the intervals on which it is increasing and those on which it is decreasing of the following function.

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

calculus derivatives real-analysis functions maxima-minima
50%
+0 −0
How can I visualize dividing by a fraction as partial and full groups?

0 answers  ·  posted 3y ago by Chgg Clou‭

visualization
40%
+0 −1
Can the bijection for the Lost Boarding Pass Probability Problem, be formulated or pictured?

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

combinatorics
50%
+0 −0
A formal-logic formula for decimal to binary conversion

3 answers  ·  posted 3y ago by deleted user  ·  last activity 3y ago by r~~‭

bases conversion
62%
+3 −1
Why are you permitted to define $1 − 1 + 1 − 1 + . . .$?

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

number-theory
40%
+0 −1
How do you calculate $P(X = n|G), P(X = n|G^C)$ by the Law of Total Probability, with extra conditioning?

0 answers  ·  posted 2y ago by DNB‭  ·  edited 2y ago by Wolgwang‭

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
40%
+0 −1
Why do 3D mental pictures usually suffice for high-dimensional geometry?

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

geometry
50%
+1 −1
How can Abraham Wald's approach lead you to ignore crucial features of a problem?

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

intuition
50%
+1 −1
Intuitively, why does A, B independent $\iff$ A, $B^C$ independent $\iff A^C, B^C$ independent?

1 answer  ·  posted 2y ago by DNB‭  ·  last activity 2y ago by JRN‭

probability
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

combinatorics
33%
+0 −2
Why so many books on introduction or bridges to proofs for undergraduates?

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

logic
37%
+1 −3
How can you analogize mathematical induction to dominoes falling, if some domino can fail to topple? [closed]

1 answer  ·  posted 2y ago by Chgg Clou‭  ·  closed 2y ago by Peter Taylor‭

induction
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
50%
+1 −1
Rules of checking differentiability for Rolle's theorem

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

calculus real-analysis limits differentiability rolle's-theorem
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
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