Question

Is this a valid way to derive the second quantifier negation law from the first one?

score 64 · Answer 1 · 2026-04-13 20:17:00

64

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Is this a valid way to derive the second quantifier negation law from the first one?

Published on 13 Apr 2026 - 20:17

score 104 · Answer 2 · 2026-05-11 02:03:07

104

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Prove that a column stochastic matrix can't have an eigenvalue equal to -1. Is this proof correct? If not, how to fix it?

Published on 11 May 2026 - 2:03

score 210 · Answer 3 · 2026-04-14 02:24:23

210

Views

Prove group and opposite group are isomorphic.

Published on 14 Apr 2026 - 2:24

score 106 · Answer 4 · 2026-04-16 03:56:09

106

Views

Let $f(x)$ be a function such that $\int_{1}^{x^2} (\cos(\pi t))f(t)dt=\sqrt{x^2+x-2}$. Calculate $f(4)$.

Published on 16 Apr 2026 - 3:56

score 75 · Answer 5 · 2026-04-17 10:23:35

75

Views

Evaluating $\lim_{x \to 0}\frac{\tan^2x-x^2}{x^2\tan^2x}$

Published on 17 Apr 2026 - 10:23

score 52 · Answer 6 · 2026-04-16 01:53:38

52

Views

Show that $\|\phi_x - \phi_y \|=d(x,y)$ for all $x,y \in X$.

Published on 16 Apr 2026 - 1:53

score 271 · Answer 7 · 2026-04-13 08:36:37

271

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Mathematical Statistics: Exercises and Solutions by Jun Shao Chapter $1$ Exercise $15$ (on paper, no calculators)

Published on 13 Apr 2026 - 8:36

score 88 · Answer 8 · 2026-04-15 03:51:06

88

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How to simplify $\dfrac{x+2}{x^2-2x-3}+\dfrac{x}{x^2-2x}$

Published on 15 Apr 2026 - 3:51

score 48 · Answer 9 · 2026-04-22 12:15:45

48

Views

Solving for the points that can solve the equation $6x-3y+9z=18$

Published on 22 Apr 2026 - 12:15

score 85 · Answer 10 · 2026-04-16 03:23:32

85

Views

If $a,b$ are two distinct real numbers, then either $\frac{a+b}{2}>a$ or $\frac{a+b}{2}>b$

Published on 16 Apr 2026 - 3:23

score 57 · Answer 11 · 2026-04-14 20:38:43

57

Views

Verify my proof: if $A \Delta B \subseteq A$ then $B \subseteq A$

Published on 14 Apr 2026 - 20:38

score 81 · Answer 12 · 2026-04-12 02:44:33

81

Views

Proof verification: $\ 2^{n-1} \leq n! $

Published on 12 Apr 2026 - 2:44

score 34 · Answer 13 · 2026-04-14 09:03:23

34

Views

Finding all vectors of length $1$ that are perpendicular to a given two dimensional vector

Published on 14 Apr 2026 - 9:03

score 122 · Answer 14 · 2026-04-14 07:09:35

122

Views

Let $f(x)=x^2-8x+4$, where $x\in[4,\infty)$. Show that $f$ is one-to-one.

Published on 14 Apr 2026 - 7:09

score 73 · Answer 15 · 2026-04-17 13:02:01

73

Views

Let the functions $f$, $g$ and $h$ be given, compute $(f \circ g \circ h)(4)$

Published on 17 Apr 2026 - 13:02

List Question

Is this a valid way to derive the second quantifier negation law from the first one?

Prove that a column stochastic matrix can't have an eigenvalue equal to -1. Is this proof correct? If not, how to fix it?

Prove group and opposite group are isomorphic.

Let $f(x)$ be a function such that $\int_{1}^{x^2} (\cos(\pi t))f(t)dt=\sqrt{x^2+x-2}$. Calculate $f(4)$.

Evaluating $\lim_{x \to 0}\frac{\tan^2x-x^2}{x^2\tan^2x}$

Show that $\|\phi_x - \phi_y \|=d(x,y)$ for all $x,y \in X$.

Mathematical Statistics: Exercises and Solutions by Jun Shao Chapter $1$ Exercise $15$ (on paper, no calculators)

How to simplify $\dfrac{x+2}{x^2-2x-3}+\dfrac{x}{x^2-2x}$

Solving for the points that can solve the equation $6x-3y+9z=18$

If $a,b$ are two distinct real numbers, then either $\frac{a+b}{2}>a$ or $\frac{a+b}{2}>b$

Verify my proof: if $A \Delta B \subseteq A$ then $B \subseteq A$

Proof verification: $\ 2^{n-1} \leq n! $

Finding all vectors of length $1$ that are perpendicular to a given two dimensional vector

Let $f(x)=x^2-8x+4$, where $x\in[4,\infty)$. Show that $f$ is one-to-one.

Let the functions $f$, $g$ and $h$ be given, compute $(f \circ g \circ h)(4)$

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