Mathematics

40%

+0 −1

How to compare lotteries, when one has highest probability of winning the jackpot, but another the highest Expected Value?

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

lottery

71%

+3 −0

Closed-form expression for sum of Modulo Arithmetic Progression

1 answer · posted 5d ago by theabbie‭ · edited 4d ago by trichoplax‭

formula summation sequence modular-arithmetic

77%

+5 −0

Finding a single row of Matrix after exponentiation

1 answer · posted 5d ago by theabbie‭ · edited 4d 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 16d ago by TextKit‭ · closed 16d 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 23d ago by DNB‭ · last activity 20d ago by r~~‭

statistics

37%

+1 −3

25% probability that there was a chance of avoiding injury $\quad$ vs. $\quad$ 25% chance of avoiding injury

1 answer · posted 1mo ago by DNB‭ · last activity 24d ago by Tim Pederick‭

probability

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 27d ago by DNB‭ · edited 27d ago by DNB‭

lottery

80%

+6 −0

Does this generalization of path-connectedness also cover general connectedness?

1 answer · posted 2y ago by celtschk‭ · last activity 29d ago by ronno‭

topology connectedness

50%

+0 −0

Universal property of quotient spaces

2 answers · posted 4mo ago by Snoopy‭ · last activity 29d 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 1mo ago by Chgg Clou‭ · edited 1mo 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?

1 answer · posted 2mo ago by Chgg Clou‭ · last activity 1mo ago by Tim Pederick‭

high-school-mathematics

25%

+0 −4

What's mathematically fallacious with Edvin Hiltner's Lotterycodex patterns, to maximize your chance of winning lotteries? [closed]

0 answers · posted 2mo ago by Chgg Clou‭ · closed 2mo ago by Mithical‭

lottery

60%

+1 −0

Considering the "type" $\Pi x:A.\Pi y:B(x).Type$

0 answers · posted 2mo ago by user205‭ · edited 2mo ago by user205‭

type-theory logic

60%

+1 −0

Defining the two universes from Calculus of Constructions in LF

0 answers · posted 2mo ago by user205‭ · edited 2mo ago by user205‭

type-theory logic

66%

+2 −0

On Tarski-style universes in type theory

1 answer · posted 2mo ago by user205‭ · last activity 2mo ago by Derek Elkins‭

type-theory logic

66%

+2 −0

The purpose of logical frameworks in specifying type theories

1 answer · posted 2mo ago by user205‭ · last activity 2mo 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 2mo ago by Chgg Clou‭ · edited 2mo 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 2mo ago by Chgg Clou‭ · closed 2mo ago by Peter Taylor‭

high-school-mathematics

22%

+0 −5

Isn't Ontario 49 always worse than Daily Grand? [closed]

0 answers · posted 3mo ago by Chgg Clou‭ · closed 2mo ago by Peter Taylor‭

lottery

60%

+1 −0

The meaning of $\pm$

2 answers · posted 2mo ago by tommi‭ · last activity 2mo ago by Derek Elkins‭

notation

22%

+0 −5

At what jackpot minimum is playing Lottario rational?

1 answer · posted 3mo ago by Chgg Clou‭ · edited 2mo ago by Chgg Clou‭

lottery

60%

+1 −0

Connection between caustics and conjugate points?

0 answers · posted 3mo ago by tommi‭

differential-geometry

66%

+2 −0

Unification and generalization of limit and colimit

1 answer · posted 4mo ago by celtschk‭ · last activity 4mo ago by Derek Elkins‭

limits category-theory

75%

+4 −0

Generalization of categorical product

1 answer · posted 4mo ago by r~~‭ · last activity 4mo 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 4mo ago by Snoopy‭ · last activity 4mo ago by celtschk‭

topology

54%

+4 −3

Is it worth it to replace Arabic numerals with Kaktovik numerals?

1 answer · posted 5mo ago by GoldenGold‭ · last activity 4mo ago by DavidCary‭

Kaktovik numerals

50%

+0 −0

Finding a quadratic that has solutions to given values

1 answer · posted 4mo ago by brah‭ · last activity 4mo 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 7mo ago by siric‭ · edited 4mo ago by tommi‭

probability convex-hull

71%

+3 −0

Prove that 49 is the only prime square to be followed by twice a prime square and then a semiprime

0 answers · posted 4mo ago by Peter Taylor‭ · edited 4mo ago by Peter Taylor‭

number-theory integer-sequences

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 9mo ago by Grove‭ · edited 4mo 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 4mo 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 4mo 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 5mo ago by TextKit‭ · edited 5mo ago by trichoplax‭

line-integral

66%

+2 −0

Proving $|{\bf R}^{\bf R}|=|2^{\bf R}|$ using the Schroeder-Bernstein Theorem

2 answers · posted 5mo ago by Snoopy‭ · last activity 5mo ago by celtschk‭

set-theory

28%

+0 −3

Expanding the Integration problem.

1 answer · posted 5mo ago by Anonymous‭ · last activity 5mo ago by TextKit‭

integration

77%

+5 −0

What is the Name of Function for Probability of a Certain Sum on Random Die Rolls?

1 answer · posted 5mo ago by James McLellan‭ · last activity 5mo 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 7mo ago by beloh‭ · edited 5mo ago by beloh‭

arithmetic algebra series

60%

+1 −0

Dividing a cuboid in four

1 answer · posted 6mo ago by Yair Rand‭ · last activity 5mo ago by Peter Taylor‭

geometry

66%

+2 −0

Example of $f:[0,1]\to\mathbf{R}$ with $\lim_{a\to 0^+}\int_a^1f(x)dx=L $ for some real number $L$ but $\int_0^1|f(x)|dx=\infty $

1 answer · posted 6mo ago by Snoopy‭ · last activity 6mo ago by r~~‭

real-analysis improper-integral

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 6mo ago by Snoopy‭ · last activity 6mo 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 9mo ago by Snoopy‭ · last activity 6mo ago by Tim Pederick‭

euclidean-geometry vector

75%

+4 −0

Is this formula for the minimal sum correct?

1 answer · posted 8mo ago by celtschk‭ · last activity 7mo 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 7mo ago by sepiabrown‭ · last activity 7mo 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 8mo ago by Chgg Clou‭ · last activity 8mo 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 8mo 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 8mo ago by Snoopy‭ · last activity 8mo ago by Snoopy‭

multivariable-calculus derivatives

71%

+3 −0

How to calculate remaining volume of a wire spool

2 answers · posted 8mo ago by re89j‭ · last activity 8mo ago by Olin Lathrop‭

geometry volume

28%

+0 −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 2y ago by DNB‭ · edited 8mo 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 2y ago by The Amplitwist‭ · edited 8mo ago by Peter Taylor‭

product definition notation algebra

71%

+3 −0

Finding distance to parabola's focus, given some points

1 answer · posted 1y ago by msh210‭ · edited 8mo ago by Peter Taylor‭

geometry conics

Communities