List questions from solution-verification

Published on 16 Apr 2026 - 15:54

43

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From a box of $30$ balls ($5$ in each of $6$ colours), we draw $5$ balls. How many combinations are there about the colours of $5$ balls?

Published on 15 Apr 2026 - 6:40

60

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An equivalent definition of a symmetric operator on a Hilbert space

Published on 19 Apr 2026 - 17:12

37

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Proof Verification for Analysis problem

Published on 09 Apr 2026 - 8:54

53

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Natural irrationalities for infinite Galois extensions

Published on 16 May 2026 - 3:52

199

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Five new results on Conway's 99-graph problem

Published on 11 May 2026 - 6:15

175

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On the proof of the Hölder inequality.

Published on 15 May 2026 - 8:44

85

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Calculate Number of Permissible Permutations

Published on 13 Apr 2026 - 1:12

1.1k

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Is proof of the law of identity a case of circular reasoning?

Published on 10 Apr 2026 - 5:57

75

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If $A$ is maximal monotone and symmetric, then its resolvent and Yosida approximation are symmetric

Published on 14 May 2026 - 9:03

87

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Find all functions over $\mathbb{Z}^+$ satisfying this divisibility criterion

Published on 14 Apr 2026 - 7:49

138

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Function on the real plane that can be expressed in terms of a function on the real line

Published on 08 Apr 2026 - 20:10

112

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Prove that the equalities $A(B\cap C)=AB\cap AC$ and $(A\cap B)C=AC\cap BC$ do not generally hold.

Published on 15 Apr 2026 - 5:31

101

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Krull Dimension of $\mathbb{C}[[X,Y]]/(Y^2)$

Published on 26 Mar 2026 - 17:52

52

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Rationals in R and deformation retract of set

Published on 15 Apr 2026 - 5:47

List Question

Suppose $A\setminus B \subseteq C\cap D$ and $x\in A$. Prove that $x\notin D \rightarrow x\in B$

From a box of $30$ balls ($5$ in each of $6$ colours), we draw $5$ balls. How many combinations are there about the colours of $5$ balls?

An equivalent definition of a symmetric operator on a Hilbert space

Proof Verification for Analysis problem

Natural irrationalities for infinite Galois extensions

Five new results on Conway's 99-graph problem

On the proof of the Hölder inequality.

Calculate Number of Permissible Permutations

Is proof of the law of identity a case of circular reasoning?

If $A$ is maximal monotone and symmetric, then its resolvent and Yosida approximation are symmetric

Find all functions over $\mathbb{Z}^+$ satisfying this divisibility criterion

Function on the real plane that can be expressed in terms of a function on the real line

Prove that the equalities $A(B\cap C)=AB\cap AC$ and $(A\cap B)C=AC\cap BC$ do not generally hold.

Krull Dimension of $\mathbb{C}[[X,Y]]/(Y^2)$

Rationals in R and deformation retract of set

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