Mathematics

40%

+0 −1

$\int dx dy dz d p_x dp_y dp_z$ Does it have any physical meaning?

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

integration line-integral integral

42%

+1 −2

Is $r \times \frac{d}{dt} mv=\frac{d}{dt} (r \times mv)$

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

differentiation

42%

+1 −2

In $w_{k + 1} - w_k = (\frac{1 - p}{p})^{exponent}(w_1 - w_0)$, why isn't exponent $k + 1$?

1 answer · posted 3y ago by DNB‭ · last activity 3y ago by leovt‭

probability

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

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 3y ago by DNB‭ · last activity 2y ago by Giannis‭

probability

28%

+0 −3

How would you intuit, and soothsay to rewrite, "both girls, ≥ 1 winter girl" as "both girls, ≥ 1 winter child"?

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

probability

33%

+0 −2

How does counting E twice explain the discrepancy between the third between C and E, third between E and G v. fifth between C and G?

1 answer · posted 3y ago by Chgg Clou‭ · last activity 2y ago by leovt‭

arithmetical-hierarchy

33%

+0 −2

How can I visualize the Law of Total Probability with extra conditioning?

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

probability visualization

40%

+0 −1

If A & B are joint, can Arby recoup some of his loss only when $P_{Arby}(A \cup B) < P_{Arby}(A) + P_{Arby}(B)$?

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

probability

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

50%

+0 −0

How does $P(C > D \mid C = 2) \neq P(C > D \mid C \neq 2)$ prove that B > C depends on C > D?

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

probability

40%

+0 −1

Why must percent change divide the difference by the old, NOT new, value?

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

percentage

28%

+0 −3

Why shouldn't the Bose-Einstein value be used to calculate birthday probabilities?

0 answers · posted 3y ago by DNB‭

probability

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 3y ago by DNB‭ · edited 2y ago by DNB‭

probability

50%

+0 −0

How to intuit : married smokers × all people < all smokers × all married people ?

0 answers · posted 3y ago by Chgg Clou‭

probability

71%

+3 −0

Cutting the square

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

geometry

42%

+1 −2

How do mathematicians measure shape perimeters?

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

geometry

33%

+0 −2

Intuitively, why can $a, b$ cycle in ${\color{red}{b}} = \frac c{\color{red}{a}} \iff {\color{red}{a}} = \frac c{\color{red}{b}}$?

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

arithmetic

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

71%

+3 −0

What does the distribution of a strictly increasing random walk look like if you stop at `N` steps?

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

combinatorics

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

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 1y ago by Peter Taylor‭

notation

40%

+0 −1

What is the meaning of integration under integral sign?

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

calculus integration

40%

+2 −4

Why does “unless” mean “if not”?

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

logic

75%

+4 −0

In $P(X\leq q)$, what do we call $q$?

1 answer · posted 3y ago by anoldmaninthesea‭ · last activity 3y ago by gramps‭

probability

50%

+1 −1

Intuitively, why does A, B independent $\iff$ A, $B^C$ independent $\iff A^C, B^C$ independent?

1 answer · posted 3y ago by DNB‭ · last activity 3y ago by JRN‭

probability

80%

+6 −0

What surface do I get by attaching $g$ handles as well as $k$ crosscaps to a sphere?

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

geometry topology compactness connectedness sphere

89%

+15 −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

25%

+0 −4

In the Monty Hall problem, why can you just assume the contestant picked door 1? Why are you entitled to relabel the doors, or rewrite this solution with the door numbers permuted?

1 answer · posted 3y ago by DNB‭ · last activity 3y ago by Moshi‭

probability

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

37%

+1 −3

If money's less valuable in the two-bullet case of the Russian Roulette problem, then ought you pay more to remove a bullet when the gun has $\ge 2$ bullets?

0 answers · posted 3y ago by Chgg Clou‭

probability

28%

+0 −3

Intuitively, if you pick k out of n objects singly without replacement, why's the number of possible outcomes NOT $n(n-1) \dots [(n-(k - 1)]\color{red}{(n - k)}$?

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

probability

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

28%

+0 −3

Why aren't the "21 possibilities here" NOT equally likely?

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

probability

71%

+3 −0

Isn't it wrong to write that Indefinite Integral = Definite Integral with a variable in its Upper Limit?

2 answers · posted 3y ago by TextKit‭ · edited 3y ago by The Amplitwist‭

calculus

75%

+4 −0

Is this topology basis dependent?

1 answer · posted 3y ago by celtschk‭ · last activity 3y ago by Incnis Mrsi‭

topology linear-algebra topological-vector-spaces

28%

+0 −3

How can I exploit symmetry to intuit P(A wins) + P(B wins) = 1, without performing algebra?

0 answers · posted 3y ago by DNB‭

probability

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

50%

+0 −0

"A occurred" vs. "something must happen"

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

probability

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 3y ago by DNB‭ · edited 2y ago by Wolgwang‭

probability

33%

+0 −2

Why isn't the probability of being void in 3 specific suits $\frac{1/13}{\dbinom{52}{13}}$?

0 answers · posted 3y ago by DNB‭

probability

33%

+0 −2

What is "continuous" in Math?

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

terminology

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

50%

+0 −0

How can I visualize this Compound Interest Chart with indefinite integrals?

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

visualization

50%

+0 −0

Why paradoxical to accept \$3, and avoid betting on Dushanbe's temperature for a prize of \$10?

0 answers · posted 3y ago by Chgg Clou‭ · edited 3y ago by thelast19digitsofpi‭

probability

33%

+0 −2

If a 2nd test's independent from the 1st test, then why does $\frac{0.95}{0.05}$ figure twice in $\frac{P(D|T_1)}{P(D^C|T_1)}\frac{P(T_2|D,T_1)}{P(T_2|D^C,T_1)}$?

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

probability

33%

+0 −2

You're sampling k people from a population of size n one at a time, with replacement and with equal probabilities. Order or not?

0 answers · posted 3y ago by DNB‭

probability

50%

+0 −0

Consider the second of these integrals (What's the meaning of second right here?)

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

differentiation integration differentiation-under-integral

71%

+3 −0

Including Association Analysis results into existing Classification Model

0 answers · posted 3y ago by Guilherme Costa‭

classification association-rules

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

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