Question

Finding what value(s) of $a$ such that $u''+9u=a-x$ has a solution with $u(0)=u(\pi)=0$

score 67 · Answer 1 · 2026-04-13 20:14:45

67

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Finding what value(s) of $a$ such that $u''+9u=a-x$ has a solution with $u(0)=u(\pi)=0$

Published on 13 Apr 2026 - 20:14

score 574 · Answer 2 · 2026-05-11 04:19:18

574

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How to define a Weil divisor from a Cartier divisor on a variety?

Published on 11 May 2026 - 4:19

score 182 · Answer 3 · 2026-05-10 23:56:21

182

Views

Elementary Proof Relating to Pythagorean Triples

Published on 10 May 2026 - 23:56

score 69 · Answer 4 · 2026-04-28 16:33:20

69

Views

What is wrong with my attempt of $0 \lt w \lt \frac{\pi}{6}$ then $w \csc w$ is?

Published on 28 Apr 2026 - 16:33

score 2.9k · Answer 5 · 2026-04-11 21:49:46

2.9k

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Show $\lim_{h \to \ 0} \frac{f(x + 2h) - 2f(x+h) + f(x)}{h^{2}} = f''(x)$ Proof verification

Published on 11 Apr 2026 - 21:49

score 142 · Answer 6 · 2026-04-15 13:12:46

142

Views

Second order differential equation check. Find general solution

Published on 15 Apr 2026 - 13:12

score 145 · Answer 7 · 2026-04-30 09:46:49

145

Views

Intersection of Topologies, I would like to know if the proof is well.

Published on 30 Apr 2026 - 9:46

score 544 · Answer 8 · 2026-04-11 17:33:19

544

Views

Proof: n can be written as the sum of a nonnegative multiple of 4 and a nonnegative multiple of 5.

Published on 11 Apr 2026 - 17:33

score 34 · Answer 9 · 2026-04-14 23:14:03

34

Views

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Published on 14 Apr 2026 - 23:14

score 173 · Answer 10 · 2026-05-13 17:59:50

173

Views

monotone class theorem application, equality!

Published on 13 May 2026 - 17:59

score 347 · Answer 11 · 2026-04-16 15:56:42

347

Views

Find for given upper-bound, epsilon.

Published on 16 Apr 2026 - 15:56

score 145 · Answer 12 · 2026-05-10 15:45:59

145

Views

Find maximum of function $A=\sum _{cyc}\frac{1}{a^2+2}$

Published on 10 May 2026 - 15:45

score 71 · Answer 13 · 2026-04-30 09:46:30

71

Views

Group Theory and Cosets.

Published on 30 Apr 2026 - 9:46

score 51 · Answer 14 · 2026-04-15 15:02:46

51

Views

Prove a set of vectors $A_i$ perpendicular in pairs is linearly independent

Published on 15 Apr 2026 - 15:02

score 86 · Answer 15 · 2026-04-12 00:34:35

86

Views

How to use of the constant " False" in a predicate logic implication appearing in a proof of : X included in EmptySet <=> X is empty

Published on 12 Apr 2026 - 0:34

List Question

Finding what value(s) of $a$ such that $u''+9u=a-x$ has a solution with $u(0)=u(\pi)=0$

How to define a Weil divisor from a Cartier divisor on a variety?

Elementary Proof Relating to Pythagorean Triples

What is wrong with my attempt of $0 \lt w \lt \frac{\pi}{6}$ then $w \csc w$ is?

Show $\lim_{h \to \ 0} \frac{f(x + 2h) - 2f(x+h) + f(x)}{h^{2}} = f''(x)$ Proof verification

Second order differential equation check. Find general solution

Intersection of Topologies, I would like to know if the proof is well.

Proof: n can be written as the sum of a nonnegative multiple of 4 and a nonnegative multiple of 5.

Find solution to second order linear differential equation in 3 parts.

monotone class theorem application, equality!

Find for given upper-bound, epsilon.

Find maximum of function $A=\sum _{cyc}\frac{1}{a^2+2}$

Group Theory and Cosets.

Prove a set of vectors $A_i$ perpendicular in pairs is linearly independent

How to use of the constant " False" in a predicate logic implication appearing in a proof of : X included in EmptySet <=> X is empty

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