List questions from proof-writing

Published on 12 Apr 2026 - 14:10

297

Views

Proving a function isn't injective by considering inverse

Published on 11 Apr 2026 - 19:15

1.1k

Views

Prove $f:\mathbb{R^2}\rightarrow \mathbb{R}$ not injective by Inverse Function Theorem

Published on 15 Apr 2026 - 19:50

132

Views

Prove that $\cos{x} \cdot \cos{\sqrt{3}x} = 1$ has exactly one solution at $x=0$

Published on 15 Apr 2026 - 20:19

487

Views

Should I finish How to Prove it by Velleman or any other proof technique book before starting Stephen Abbott's Understanding Analysis?

Published on 12 Apr 2026 - 5:42

78

Views

Proof of the inequality of sums

Published on 11 Apr 2026 - 14:26

88

Views

Finding the determinant of a $2\times 2$ matrix

Published on 12 Apr 2026 - 7:09

236

Views

Exercise about primes in the ring of Gaussian integers

Published on 13 Apr 2026 - 9:02

41

Views

Show that a function on invertible operators is continuous

Published on 11 Apr 2026 - 23:25

57

Views

Show that the following sequence is unbounded.

Published on 14 Apr 2026 - 1:54

92

Views

Injectivity of $g(x,y)=(2ye^{2x},xe^y)$ from $(0,1)$, onto $(2,0)$

Published on 16 Apr 2026 - 16:52

397

Views

logic - identifying the domain of discourse in an existentially quantified statement

Published on 10 Apr 2026 - 18:33

1.1k

Views

Can I justify removing a universal quantifier in this proof?

Published on 12 Apr 2026 - 12:01

2.8k

Views

If sup A $\lt$ sup B show that an element of $B$ is an upper bound of $A$

Published on 14 Apr 2026 - 21:33

53

Views

Exercise about the form of elements of $\mathbb{Q}(u)$

Published on 17 Apr 2026 - 6:22

List Question

If component functions are injective then is the function injective?

Proving a function isn't injective by considering inverse

Prove $f:\mathbb{R^2}\rightarrow \mathbb{R}$ not injective by Inverse Function Theorem

Prove that $\cos{x} \cdot \cos{\sqrt{3}x} = 1$ has exactly one solution at $x=0$

Should I finish How to Prove it by Velleman or any other proof technique book before starting Stephen Abbott's Understanding Analysis?

Proof of the inequality of sums

Finding the determinant of a $2\times 2$ matrix

Exercise about primes in the ring of Gaussian integers

Show that a function on invertible operators is continuous

Show that the following sequence is unbounded.

Injectivity of $g(x,y)=(2ye^{2x},xe^y)$ from $(0,1)$, onto $(2,0)$

logic - identifying the domain of discourse in an existentially quantified statement

Can I justify removing a universal quantifier in this proof?

If sup A $\lt$ sup B show that an element of $B$ is an upper bound of $A$

Exercise about the form of elements of $\mathbb{Q}(u)$

Trending Questions

Popular # Hahtags

Popular Questions