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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)
50%
+1 −1
In general, does $\color{forestgreen}{P(A|M)} + \color{red}{P(B|M)} = 1$?

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

probability
50%
+1 −1
Acceptable, usual to write $\ge 2$ pipes simultaneously?

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

probability
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 3y ago by DNB‭  ·  edited 3y ago by DNB‭

probability
71%
+3 −0
Is Pythagorean theorem really valid in higher dimensional space?

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

pythagoras right-triangle
33%
+0 −2
Is Mathematical Induction truly "induction", or misnamed? [closed]

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

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

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

geometry area point border perimeter
40%
+0 −1
Why must percent change divide the difference by the old, NOT new, value?

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

percentage
60%
+1 −0
If a matrix has lots of values in a column but, not in row than, what that actually called?

1 answer  ·  posted 3y ago by deleted user  ·  last activity 3y ago by 4015.alt‭

linear-algebra matrices
60%
+1 −0
What does upper indices represent?

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

notation tensors
50%
+0 −0
What is the parallel for edges?

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

geometry terminology
33%
+2 −6
Can we add without using addition?

3 answers  ·  posted 3y ago by General Sebast1an‭  ·  last activity 3y ago by DavidCary‭

equation arithmetic
28%
+0 −3
How can Cross Multiplication be intuited or pictured? [closed]

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

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

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

arithmetic
57%
+2 −1
Third kind of infinite

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

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

0 answers  ·  posted 3y ago by deleted user  ·  closed 3y ago by Peter Taylor‭

topology soft-question
50%
+0 −0
transpose matrix and general matrix is completely messed up

1 answer  ·  posted 3y ago by deleted user  ·  edited 3y ago by Peter Taylor‭

matrices matrix-transpose
50%
+0 −0
Probability of students given there are groups

0 answers  ·  posted 3y ago by Pranav_M99‭  ·  edited 3y ago by Peter Taylor‭

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

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

combinatorics
66%
+2 −0
ratio of partial sums of the same geometric sequence

1 answer  ·  posted 3y ago by msh210‭  ·  last activity 3y ago by Peter Taylor‭

geometric-sequence partial-sum
71%
+3 −0
What does the distribution of a strictly increasing random walk look like if you stop at `N` steps?

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

combinatorics
60%
+1 −0
What it ≡ called?

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

symbols
40%
+0 −1
$\int dx dy dz d p_x dp_y dp_z$ Does it have any physical meaning?

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

integration line-integral integral
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 3y ago by DNB‭

probability
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 3y 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 3y ago by Giannis‭

probability
77%
+5 −0
Getting backward of partial differentiation's chain rule

3 answers  ·  posted 3y ago by deleted user  ·  last activity 3y ago by Derek Elkins‭

multivariable-calculus differentiation chain-rule
33%
+0 −2
Which vertical line signifies "putting the cutoff for a positive result at a very low level"?

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

probability
40%
+0 −1
What to do when there's lot of function of time? (For integration) Should I consider them as constant?

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

integration
50%
+0 −0
Consider the second of these integrals (What's the meaning of second right here?)

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

differentiation integration differentiation-under-integral
71%
+3 −0
What're the orders for equation expressing?

2 answers  ·  posted 3y ago by General Sebast1an‭  ·  last activity 3y ago by r~~‭

exponent equation order grouping arithmetic
33%
+0 −2
Why's the true positive rate termed Sensitivity and true negative rate Specificity, not vice versa? [closed]

0 answers  ·  posted 3y ago by DNB‭  ·  closed 3y ago by Peter Taylor‭

probability
28%
+0 −3
Why aren't the "21 possibilities here" NOT equally likely?

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

probability
33%
+0 −2
How can I visualize the Law of Total Probability with extra conditioning?

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

probability visualization
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 3y ago by Wolgwang‭

basic
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 3y ago by Wolgwang‭

probability
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 3y ago by Wolgwang‭

probability
33%
+0 −2
Does "both girls, ≥ 1 winter girl" = "both girls, ≥ 1 winter child" let you generalize the problem statement that postulated both children as girls?

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

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

probability
71%
+3 −0
Find limits of integration in polar coordinates

2 answers  ·  posted 3y ago by MissMulan‭  ·  last activity 3y ago by r~~‭

calculus double-integrals polar
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 3y ago by leovt‭

arithmetical-hierarchy
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 3y ago by DNB‭  ·  edited 3y ago by DNB‭

probability
42%
+1 −2
Is $r \times \frac{d}{dt} mv=\frac{d}{dt} (r \times mv)$

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

differentiation
71%
+3 −0
Why would skyrocketing the numbers of doors help laypeople intuit the Monty Hall Problem?

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

probability
33%
+0 −2
What is "continuous" in Math?

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

terminology
40%
+0 −1
How to find constant equal to what in integration?

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

classical-mechanics integration
50%
+0 −0
Is $x=\int \int \ddot{x}\mathrm dx \mathrm dx$?

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

multivariable-calculus
66%
+2 −0
Do these major triangle lines have names?

0 answers  ·  posted 3y ago by Peter Taylor‭

euclidean-geometry triangle plane-geometry nomenclature
50%
+0 −0
Prove that $\int \ddot{x}(t)\mathrm dt=v_0 + \frac{F_0}{m}t$

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

classical-mechanics integration
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