Hottest Questions This Month

23

votes

15

answers

3k

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Simple way of explaining the empty product [closed]

exponential-function arithmetic

modified Oct 8 at 7:31 hkBst 338

47

votes

11

answers

10k

views

$7$ fishermen caught exactly 100 fish and no two had caught the same number of fish. Then there are three who have together captured at least 50 fish.

modified Oct 11 at 19:28 greedoid 32k

47

votes

5

answers

3k

views

Solution to the equation of a polynomial raised to the power of a polynomial.

algebra-precalculus polynomials systems-of-equations

modified Oct 7 at 7:25 Adayah 6,830

20

votes

7

answers

6k

views

Paradox about the volume of a cylinder

calculus integration proof-verification volume infinitesimals

modified Oct 2 at 15:17 Michael Hardy 1

31

votes

4

answers

2k

views

What is the reasoning behind this exponents question?

notation exponentiation

answered Oct 11 at 16:00 Ilikemath 1

10

votes

3

answers

3k

views

Chances of rolling “Snake Eyes” at least once in a series of rolls.

probability dice

modified Oct 4 at 13:00 J. M. is not a mathematician 60.2k

17

votes

2

answers

3k

views

Why is $\sum_{i=1}^n a$ always irrational if $n>0$ and $a$ is irrational?

summation irrational-numbers rationality-testing

modified Sep 26 at 7:41 Martigan 5,165

25

votes

4

answers

1k

views

Double summation with improper integral

integration summation geometric-progressions

modified Oct 2 at 6:41 manooooh 500

6

votes

8

answers

2k

views

Prove that the quantity is an integer

elementary-number-theory induction

modified Oct 8 at 20:37 Bill Dubuque 204k

25

votes

4

answers

5k

views

Why does Wolfram|Alpha make a mistake here?

calculus limits wolfram-alpha

answered Oct 9 at 13:33 TonyK 39.6k

13

votes

3

answers

1k

views

What is symmetric about set symmetric difference?

elementary-set-theory

answered Oct 10 at 4:50 Acccumulation 6,159

22

votes

4

answers

2k

views

Why doesn't the Stone-Weierstrass theorem imply that every function has a power series expansion?

calculus real-analysis power-series

modified Oct 12 at 9:54 Pedro A 1,909

11

votes

4

answers

3k

views

Difference between $⊂$ and $⊆$?

discrete-mathematics elementary-set-theory notation

modified Oct 4 at 16:26 fleablood 63.5k

8

votes

5

answers

2k

views

Construct a continuous real valued function which takes zero on integers and such that image of function is not closed.

real-analysis general-topology functions continuity

answered Oct 18 at 22:43 zhw. 68.8k

7

votes

4

answers

1k

views

How can I prove this statement about subsets?

elementary-set-theory logic

answered Sep 27 at 12:08 Nemo 21

23

votes

3

answers

1k

views

Are real and complex analysis related in any way?

real-analysis complex-analysis

modified Oct 9 at 7:38 user29418 375

10

votes

8

answers

249

views

General formula for nth element of the sequence 0, 1, 0, 1, …

sequences-and-series arithmetic pattern-recognition

answered Oct 12 at 13:28 Stijn Dietz 391

10

votes

6

answers

3k

views

Optimization explained to a middle school kid

optimization intuition

modified Sep 26 at 6:57 Daniel R 2,462

8

votes

3

answers

2k

views

Why is this definition of convergence incorrect?

real-analysis convergence

modified Oct 2 at 5:43 Rahul 32.7k

6

votes

3

answers

3k

views

A standard and rigorous proof using the pigeonhole principle

combinatorics pigeonhole-principle

modified Oct 11 at 1:16 Ari Brodsky 302

29

votes

3

answers

1k

views

Questions on a self-made theorem about polynomials

polynomials summation binomial-coefficients

answered Oct 3 at 14:09 Tom-Tom 5,987

15

votes

4

answers

1k

views

Analogy between the fundamental theorems of arithmetic and algebra

abstract-algebra arithmetic

modified Oct 10 at 10:18 José Carlos Santos 131k

14

votes

4

answers

2k

views

Spheres cause contradictions in dimensions $10$ and more?

geometry euclidean-geometry spheres paradoxes

modified Sep 26 at 3:33 user21820 37.5k

15

votes

6

answers

1k

views

How to solve these $3$ equations for three unknowns $x$,$y$,$z$? [closed]

algebra-precalculus contest-math systems-of-equations

modified Oct 3 at 15:37 Rushabh Mehta 3,608

3

votes

5

answers

819

views

How to map interval $[0, 100]$ to the interval $[100, 350]$?

algebra-precalculus arithmetic

modified Oct 14 at 7:21 Davislor 2,310

12

votes

5

answers

930

views

Why isn't this approach in solving $x^2+x+1=0$ valid?

algebra-precalculus proof-verification proof-writing proof-explanation

modified Sep 24 at 9:19 Yves Daoust 119k

40

votes

1

answer

7k

views

What is the Todd's function in Atiyah's paper?

analytic-number-theory fake-proofs riemann-hypothesis

modified Oct 5 at 18:00 kinokijuf 246

8

votes

5

answers

784

views

Find the probability that the thirteenth spade will appear before the thirteenth diamond?

probability combinatorics

answered Oct 1 at 16:01 Mike Earnest 18.9k

8

votes

6

answers

2k

views

Why is complete strong induction a valid proof method and not need to explicitly proof the base cases?

proof-verification logic induction proof-explanation

modified Oct 10 at 17:05 Charlie Parker 1,075

12

votes

3

answers

580

views

Does swapping columns of a matrix cause the rows of the inverse matrix to be swapped?

linear-algebra inverse

answered Sep 29 at 21:05 GEdgar 60.3k

10

votes

5

answers

1k

views

Function with arbitrary small period

periodic-functions

modified Oct 5 at 9:51 Yanko 4,357

21

votes

2

answers

986

views

Integer midpoint

combinatorics discrete-mathematics

modified Oct 9 at 15:50 Eleven-Eleven 9,013

19

votes

3

answers

911

views

Set of Elementary Real Numbers Without Elementary Combination

algebra-precalculus

answered Oct 15 at 18:12 user21820 37.5k

7

votes

3

answers

2k

views

What is the probablity of sitting next to my friend?

probability

modified Oct 17 at 11:41 amWhy 191k

4

votes

6

answers

1k

views

Probability that a 5 occurs first

probability

modified Oct 8 at 23:28 teclnol 133

4

votes

5

answers

1k

views

How many positive divisors of 2000?

combinatorics divisibility

modified Oct 18 at 8:03 TheSimpliFire 11.5k

12

votes

6

answers

208

views

Proving that $\sqrt{1 + x^2}$ is not a polynomial function

real-analysis algebra-precalculus polynomials

modified Oct 3 at 6:34 Peter Szilas 9,511

8

votes

5

answers

672

views

Finding coefficients in polynomials

algebra-precalculus polynomials

modified Sep 28 at 9:29 greedoid 32k

8

votes

6

answers

1k

views

Ratio. Number of sheep and chickens

word-problem ratio

modified Oct 4 at 20:24 David 311

11

votes

3

answers

994

views

Probability that sheepdog performs at least one task successfuly - Am I doing this problem right?

probability combinatorics

modified Sep 27 at 12:37 N. F. Taussig 41.4k

9

votes

10

answers

759

views

What does calculating the inverse of a matrix mean?

linear-algebra

answered Oct 14 at 13:33 Marco13 1,419

8

votes

6

answers

601

views

Convergence of $\sum_{n=1}^{\infty}e^{-\sqrt{n}}$ using the integral test

calculus integration sequences-and-series convergence divergent-series

modified Oct 9 at 8:52 user21820 37.5k

6

votes

5

answers

1k

views

Question about the chain rule.

calculus derivatives implicit-differentiation

answered Oct 3 at 17:11 Werner 18

6

votes

6

answers

585

views

Finding the complex square roots of a complex number without a calculator

complex-numbers radicals

modified 2 days ago Alex Francisco 18.4k

4

votes

3

answers

1k

views

Does this prove the Squeeze Theorem?

real-analysis sequences-and-series proof-verification convergence

modified Oct 9 at 10:16 José Carlos Santos 131k

10

votes

6

answers

194

views

How to compare logarithms $\log_4 5$ and $\log_5 6$?

calculus algebra-precalculus inequality logarithms a.m.-g.m.-inequality

answered Oct 9 at 18:57 Yves Daoust 119k

5

votes

3

answers

1k

views

There are three lights which can be in one of three states. Can we get the system of lights into a specific state?

linear-algebra modular-arithmetic

modified Oct 8 at 8:17 kevin cline 403

1

vote

4

answers

768

views

Wrong solution for solving $ 3x^2 - 6x - 9 = 0 $ [on hold]

algebra-precalculus arithmetic quadratics

modified Oct 18 at 19:36 Martin Sleziak 43.9k

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