Question

Prove that at least $4$ persons are common

score 90 · Answer 1 · 2026-04-15 21:05:39

90

Views

Prove that at least $4$ persons are common

Published on 15 Apr 2026 - 21:05

score 62 · Answer 2 · 2026-04-12 06:45:57

62

Views

Proof that all Quotient Groups are Abelian- where is my error?

Published on 12 Apr 2026 - 6:45

score 65 · Answer 3 · 2026-04-16 00:52:22

65

Views

Given $ax=by, a(m^2+n^2)=b(p^2+q^2), (a,b)=(x,y)=1$, show that $a,b$ must also be sums of two squares.

Published on 16 Apr 2026 - 0:52

score 108 · Answer 4 · 2026-04-16 09:54:34

108

Views

Proof verification: $[L_1L_2:K] \leq [L_1:K][L_2:K]$

Published on 16 Apr 2026 - 9:54

score 45 · Answer 5 · 2026-04-14 20:15:01

45

Views

prove $\frac{1}{2\pi i}dz/z$ is the generator of $H^1(\Bbb{P}^1\setminus \{0,\infty\},\Bbb{Z})$

Published on 14 Apr 2026 - 20:15

score 72 · Answer 6 · 2026-04-14 06:53:17

72

Views

Relation between diameter of a holomorphic function defined on the unit disc and it's derivative at 0.

Published on 14 Apr 2026 - 6:53

score 104 · Answer 7 · 2026-04-17 03:06:32

104

Views

There is $R > 0$ such that there are no holomorphic functions $f: \{z: |z| < R \} \to \mathbb C \backslash \{0,1\}$ with $f(0) = a$ and $f'(0)= b$

Published on 17 Apr 2026 - 3:06

score 134 · Answer 8 · 2026-04-13 21:13:20

134

Views

Order Statistic as a Consistent Estimator

Published on 13 Apr 2026 - 21:13

score 97 · Answer 9 · 2026-04-13 22:10:08

97

Views

probabilistic interpretation of eigenvalues of the Laplacian

Published on 13 Apr 2026 - 22:10

score 34 · Answer 10 · 2026-04-13 11:22:11

34

Views

Determine the real Fourier series for $f(t) = t^2$ with $t \in [0, 1[$ converging as fast as possible.

Published on 13 Apr 2026 - 11:22

score 39 · Answer 11 · 2026-04-14 09:21:04

39

Views

Proof the cardinality of the set of all periodic functions from $ \mathbb{R} $ to $ \mathbb{R} $ is $ \aleph_1 $

Published on 14 Apr 2026 - 9:21

score 164 · Answer 12 · 2026-04-14 03:28:39

164

Views

Simple ODE question(solution verification). A student learns 150 Chinese characters each month and forgets 10% of what they have learned

Published on 14 Apr 2026 - 3:28

score 72 · Answer 13 · 2026-03-25 22:10:35

72

Views

Prove that a transformation is a diffeomorphism and a flow. Solution verification

Published on 25 Mar 2026 - 22:10

score 59 · Answer 14 · 2026-04-13 09:41:40

59

Views

Integration. Solution verification - I need to know if my thinking is correct

Published on 13 Apr 2026 - 9:41

score 81 · Answer 15 · 2026-04-13 23:08:31

81

Views

Improve exposition of this proof: Matrix multiplication is associative, due to commutativity of underlying field

Published on 13 Apr 2026 - 23:08

List Question

Prove that at least $4$ persons are common

Proof that all Quotient Groups are Abelian- where is my error?

Given $ax=by, a(m^2+n^2)=b(p^2+q^2), (a,b)=(x,y)=1$, show that $a,b$ must also be sums of two squares.

Proof verification: $[L_1L_2:K] \leq [L_1:K][L_2:K]$

prove $\frac{1}{2\pi i}dz/z$ is the generator of $H^1(\Bbb{P}^1\setminus \{0,\infty\},\Bbb{Z})$

Relation between diameter of a holomorphic function defined on the unit disc and it's derivative at 0.

There is $R > 0$ such that there are no holomorphic functions $f: \{z: |z| < R \} \to \mathbb C \backslash \{0,1\}$ with $f(0) = a$ and $f'(0)= b$

Order Statistic as a Consistent Estimator

probabilistic interpretation of eigenvalues of the Laplacian

Determine the real Fourier series for $f(t) = t^2$ with $t \in [0, 1[$ converging as fast as possible.

Proof the cardinality of the set of all periodic functions from $ \mathbb{R} $ to $ \mathbb{R} $ is $ \aleph_1 $

Simple ODE question(solution verification). A student learns 150 Chinese characters each month and forgets 10% of what they have learned

Prove that a transformation is a diffeomorphism and a flow. Solution verification

Integration. Solution verification - I need to know if my thinking is correct

Improve exposition of this proof: Matrix multiplication is associative, due to commutativity of underlying field

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