Question

Second order ODE solution verification

score 31 · Answer 1 · 2020-04-18 11:36:57

31

Views

Second order ODE solution verification

Published on 18 Apr 2020 - 11:36

score 768 · Answer 2 · 2026-03-25 10:55:23

768

Views

Proof about the recursive definition of a palindrome

Published on 25 Mar 2026 - 10:55

score 509 · Answer 3 · 2026-04-07 02:22:24

509

Views

Prove that the dot product of two timelike vectors cannot be $0$

Published on 07 Apr 2026 - 2:22

score 86 · Answer 4 · 2020-04-18 15:34:11

86

Views

Showing that the intersection of simple sets is a simple set

Published on 18 Apr 2020 - 15:34

score 1.6k · Answer 5 · 2026-04-03 00:00:27

1.6k

Views

If two tangents can be drawn to different tangents of a hyperbola $\frac{x^2}{1}-\frac{y^2}{4}=1$ from the point $(a,a^2)$, then find range of $a$

Published on 03 Apr 2026 - 0:00

score 172 · Answer 6 · 2026-03-28 07:50:17

172

Views

Gilbert-Varshamov Bound ~ Proof

Published on 28 Mar 2026 - 7:50

score 100 · Answer 7 · 2026-03-25 19:03:34

100

Views

show that for every $y$ the sequence $(\|\phi_{x_{n}}(y) \|)_{n \in \mathbb{N}}$ is bounded.

Published on 25 Mar 2026 - 19:03

score 29 · Answer 8 · 2026-03-29 06:30:34

29

Views

Is the following argument based on recurrence relations and floor functions valid?

Published on 29 Mar 2026 - 6:30

score 168 · Answer 9 · 2020-04-18 19:03:59

168

Views

Suppose that $x_n \rightarrow x$ as $ n \rightarrow \infty$. Prove from first principles that if $x_n \leq M$ for all $n$, then $x \leq M$.

Published on 18 Apr 2020 - 19:03

score 44 · Answer 10 · 2020-04-18 20:49:46

44

Views

In the analytical definition of a sequence limit, does $N$ not have to be a natural number?

Published on 18 Apr 2020 - 20:49

score 49 · Answer 11 · 2020-04-18 20:59:13

49

Views

Every Orthonormal System is Linearly Independent

Published on 18 Apr 2020 - 20:59

score 79 · Answer 12 · 2026-03-29 22:42:20

79

Views

Proof verification - If $f$ is Carathéodory, then the map $x \mapsto f(x, u(x))$ is measurable for every measurable $u$

Published on 29 Mar 2026 - 22:42

score 124 · Answer 13 · 2020-04-18 23:29:15

124

Views

Possible error in a STEP Paper: Matrix Group (STEP 1991 P2 Q9)

Published on 18 Apr 2020 - 23:29

score 629 · Answer 14 · 2020-04-19 02:55:35

629

Views

Understanding limit superior and limit inferior for sets

Published on 19 Apr 2020 - 2:55

score 55 · Answer 15 · 2026-04-02 22:25:52

55

Views

Proof by counterexample for $1+2+3+...+(n-1) = kn$

Published on 02 Apr 2026 - 22:25

List Question

Second order ODE solution verification

Proof about the recursive definition of a palindrome

Prove that the dot product of two timelike vectors cannot be $0$

Showing that the intersection of simple sets is a simple set

If two tangents can be drawn to different tangents of a hyperbola $\frac{x^2}{1}-\frac{y^2}{4}=1$ from the point $(a,a^2)$, then find range of $a$

Gilbert-Varshamov Bound ~ Proof

show that for every $y$ the sequence $(\|\phi_{x_{n}}(y) \|)_{n \in \mathbb{N}}$ is bounded.

Is the following argument based on recurrence relations and floor functions valid?

Suppose that $x_n \rightarrow x$ as $ n \rightarrow \infty$. Prove from first principles that if $x_n \leq M$ for all $n$, then $x \leq M$.

In the analytical definition of a sequence limit, does $N$ not have to be a natural number?

Every Orthonormal System is Linearly Independent

Proof verification - If $f$ is Carathéodory, then the map $x \mapsto f(x, u(x))$ is measurable for every measurable $u$

Possible error in a STEP Paper: Matrix Group (STEP 1991 P2 Q9)

Understanding limit superior and limit inferior for sets

Proof by counterexample for $1+2+3+...+(n-1) = kn$

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