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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.

337 posts   RSS
Activity Age Score Random
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33%
+0 −2
Why's the true positive rate termed Sensitivity and true negative rate Specificity, not vice versa? [closed]

0 answers  ·  posted 2y ago by DNB‭  ·  closed 2y ago by Peter Taylor‭

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

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

logic
30%
+1 −5
What did James Stewart mean by "the line integral reduces to an ordinary single integral in this case" ?

2 answers  ·  posted 1y ago by TextKit‭  ·  edited 1y ago by trichoplax‭

line-integral
28%
+0 −3
Expanding the Integration problem.

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

integration
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
28%
+0 −3
What is topology? When a person should learn it? [closed]

0 answers  ·  posted 2y ago by deleted user  ·  closed 2y ago by Peter Taylor‭

topology soft-question
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
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 3y ago by DNB‭  ·  edited 2y ago by DNB‭

probability
28%
+0 −3
How do I prove Simpson's Paradox, scilicet $P(A|B) > P(A|B^C)$?

0 answers  ·  posted 2y 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
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
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 2y ago by DNB‭

probability
28%
+0 −3
Explain to a 9 year old — To count each possibility c times, why divide by c? Why not subtract by c?

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

probability
28%
+0 −3
How do these 3 bell curves of Likelihood, Posterior, Prior pictorialize the Odds form of Bayes' rule?

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

probability
28%
+0 −3
Are Stars and Bars in Combinatorics related to the Fence Post Error?

0 answers  ·  posted 3y ago by DNB‭

combinatorics
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
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
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
28%
+0 −3
How can I exploit symmetry to intuit P(A wins) + P(B wins) = 1, without performing algebra?

0 answers  ·  posted 2y ago by DNB‭

probability
28%
+0 −3
What is a “first-order substructural logic that has a cut-free sequent calculus”?

1 answer  ·  posted 2mo ago by Julius H.‭  ·  last activity 2mo ago by Dan Doel‭

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

0 answers  ·  posted 12mo ago by TextKit‭  ·  closed 12mo ago by Mithical‭

real-analysis
28%
+0 −3
What is a dual object? [closed]

0 answers  ·  posted 2mo ago by Julius H.‭  ·  closed 2mo ago by Peter Taylor‭

category-theory
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
25%
+0 −4
What are the Peano axioms?

1 answer  ·  posted 2mo ago by Julius H.‭  ·  last activity 2mo ago by rmf‭

logic
25%
+0 −4
How can I improve contrast of red and green, to prove Reverse Triangle Inequality?

1 answer  ·  posted 7mo ago by Tortilla‭  ·  last activity 7mo ago by Peter Taylor‭

visualization
25%
+0 −4
Picking 20 different numbers, in the same draw $\;$ vs. $\;$ picking 10 different numbers, in 2 different draws.

1 answer  ·  posted 4mo ago by H7D‭  ·  last activity 4mo ago by Olin Lathrop‭

lottery
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 2y ago by DNB‭  ·  last activity 2y ago by Moshi‭

probability
25%
+0 −4
Why "only 1/10,000 men with wives they abuse subsequently murder them" ≠ P(A|G,M) & "50% of husbands who murder their wives abused them” ≠ P(G|A)?

0 answers  ·  posted 2y ago by DNB‭

probability
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
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
22%
+0 −5
How can school children intuit why over 100, D is larger? But under 100, D% is larger?

2 answers  ·  posted 1y ago by Chgg Clou‭  ·  last activity 5mo ago by Agent Smith‭

high-school-mathematics
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
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 12mo ago by DNB‭  ·  edited 12mo ago by DNB‭

lottery
20%
+0 −6
Without trial and error, average(average(a,b),c) vs. average(a,average(b,c)). [closed]

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

arithmetic
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
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 1y ago by Chgg Clou‭  ·  last activity 1y ago by Snoopy‭

arithmetical-hierarchy
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