Question

Propositional logic: how to show if tautology using proof by contradiction

score 971 · Answer 1 · 2026-04-13 04:09:27

971

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Propositional logic: how to show if tautology using proof by contradiction

Published on 13 Apr 2026 - 4:09

score 1.6k · Answer 2 · 2026-04-14 10:39:51

1.6k

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If ΔABC and ΔDEF are triangles, ∠ABC ≅ ∠DEF, ∠BCA ≅ ∠EFD, segments AB ≅ DE, then ΔABC ≅ ΔDEF.

Published on 14 Apr 2026 - 10:39

score 224 · Answer 3 · 2026-04-14 06:30:11

224

Views

Proof that $n^k$ is equal to the sum of $n$ odd numbers?

Published on 14 Apr 2026 - 6:30

score 388 · Answer 4 · 2026-04-15 12:44:13

388

Views

Understanding the proof: $M$ is a complete enumerable metric space $\Rightarrow$ $M$ has an isolated point

Published on 15 Apr 2026 - 12:44

score 67 · Answer 5 · 2026-04-08 20:32:07

67

Views

I'm having trouble understanding a proof of "the neighborhoods in R^n are open"

Published on 08 Apr 2026 - 20:32

score 126 · Answer 6 · 2026-04-14 13:24:11

126

Views

Please help me understand how $\overline{\bigcup A_\alpha}\subset \bigcup \overline{A_\alpha}$ does not hold in general.

Published on 14 Apr 2026 - 13:24

score 117 · Answer 7 · 2026-04-10 18:56:02

117

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What is meant by a "discontinuity of $1$"?

Published on 10 Apr 2026 - 18:56

score 4.5k · Answer 8 · 2026-04-12 04:11:08

4.5k

Views

$\sqrt{2}$ is irrational proof using well-Ordering Property

Published on 12 Apr 2026 - 4:11

score 41 · Answer 9 · 2026-04-14 14:30:05

41

Views

Proof of injectivity and surjectivity of $x^3 - x^2 +20$ where $x\ge\frac{2}{3}$

Published on 14 Apr 2026 - 14:30

score 38 · Answer 10 · 2026-04-12 13:21:52

38

Views

Explain what "$f$ is continuous in $x_{0}$" means in terms of limits of sequences

Published on 12 Apr 2026 - 13:21

score 5.5k · Answer 11 · 2026-04-17 13:42:21

5.5k

Views

Determine if A must be diagonalizable, never diagonalizable, or only under certain conditions

Published on 17 Apr 2026 - 13:42

score 193 · Answer 12 · 2026-05-10 23:39:31

193

Views

Question about how they get forms in proof of "The square of any odd int has the form 8m+1 for some int m"

Published on 10 May 2026 - 23:39

score 222 · Answer 13 · 2026-04-11 11:42:42

222

Views

How to proof frame is tight?

Published on 11 Apr 2026 - 11:42

score 73 · Answer 14 · 2026-04-11 06:44:18

73

Views

Cannot understand the proof of theorem $2$ of "Some Further Results on Ideal Convergence in Topological Spaces" by P.Das

Published on 11 Apr 2026 - 6:44

score 298 · Answer 15 · 2026-04-15 11:57:37

298

Views

Way to prove $\sin 3^{\circ}$ value

Published on 15 Apr 2026 - 11:57

List Question

Propositional logic: how to show if tautology using proof by contradiction

If ΔABC and ΔDEF are triangles, ∠ABC ≅ ∠DEF, ∠BCA ≅ ∠EFD, segments AB ≅ DE, then ΔABC ≅ ΔDEF.

Proof that $n^k$ is equal to the sum of $n$ odd numbers?

Understanding the proof: $M$ is a complete enumerable metric space $\Rightarrow$ $M$ has an isolated point

I'm having trouble understanding a proof of "the neighborhoods in R^n are open"

Please help me understand how $\overline{\bigcup A_\alpha}\subset \bigcup \overline{A_\alpha}$ does not hold in general.

What is meant by a "discontinuity of $1$"?

$\sqrt{2}$ is irrational proof using well-Ordering Property

Proof of injectivity and surjectivity of $x^3 - x^2 +20$ where $x\ge\frac{2}{3}$

Explain what "$f$ is continuous in $x_{0}$" means in terms of limits of sequences

Determine if A must be diagonalizable, never diagonalizable, or only under certain conditions

Question about how they get forms in proof of "The square of any odd int has the form 8m+1 for some int m"

How to proof frame is tight?

Cannot understand the proof of theorem $2$ of "Some Further Results on Ideal Convergence in Topological Spaces" by P.Das

Way to prove $\sin 3^{\circ}$ value

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