Question

Prove that if rref of matrix $\bf (v_1\space v_2 \space \cdots v_m)$ has row of zeroes, vectors $\bf v_1,\cdots v_m$ do not span $\mathbb R^{n}$

score 91 · Answer 1 · 2020-02-17 15:21:38

Prove that if rref of matrix $\bf (v_1\space v_2 \space \cdots v_m)$ has row of zeroes, vectors $\bf v_1,\cdots v_m$ do not span $\mathbb R^{n}$

score 277 · Answer 2 · 2026-02-23 02:38:26

277

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Proving Division Rings of $p^2$ Elements are Fields

Published on 23 Feb 2026 - 2:38

score 68 · Answer 3 · 2020-02-17 18:49:18

68

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Last step in a simple proof:

Published on 17 Feb 2020 - 18:49

score 537 · Answer 4 · 2020-02-17 19:12:16

537

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Question on the task: Prove $f(x)=\frac{e^x-1}{x}$ is (dis)continuous at $x=0$.

Published on 17 Feb 2020 - 19:12

score 53 · Answer 5 · 2020-02-17 21:21:58

53

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Given $\alpha_{i}$ as well as $\beta_{i}$, is there a linear transformation such that $T(\alpha_{i}) = \beta_{i}$?

Published on 17 Feb 2020 - 21:21

score 55 · Answer 6 · 2020-02-17 21:29:21

55

Views

Statements with symmetric difference - equality proof.

Published on 17 Feb 2020 - 21:29

score 110 · Answer 7 · 2020-02-17 21:38:46

110

Views

Find the slope of the graph of $xy-4y^2=2$ at $(9,2)$

Published on 17 Feb 2020 - 21:38

score 73 · Answer 8 · 2020-02-17 21:52:27

73

Views

Complex number inequality $n^2-(\Re(z^2+z^4+...+z^{2n}))^2\geq (\Im(1+z^2+...+z^{2n}))^2$

Published on 17 Feb 2020 - 21:52

score 92 · Answer 9 · 2020-02-18 00:49:27

92

Views

Proving recurrence relations using induction

Published on 18 Feb 2020 - 0:49

score 72 · Answer 10 · 2026-03-27 00:04:30

72

Views

Unique solution to ODE for $y'(t) = f(t, y(t))$ where $f$ is not continuous

Published on 27 Mar 2026 - 0:04

score 48 · Answer 11 · 2020-02-18 08:08:01

48

Views

Can someone verify this Fourier series calculation?

Published on 18 Feb 2020 - 8:08

score 92 · Answer 12 · 2020-02-18 12:22:57

92

Views

$T\in \mbox{End}(V)$. If $p|m_T,$ then there is a vector $v$ such that the minimal polynomial of $v$ is exactly $p$.

Published on 18 Feb 2020 - 12:22

score 106 · Answer 13 · 2026-03-28 16:45:52

106

Views

Counter intuitive Prior/Posterior relationship in Bayesian inference for estimated probability fusion

Published on 28 Mar 2026 - 16:45

score 983 · Answer 14 · 2026-03-27 08:46:37

983

Views

Let $(T_n)$ be a sequence of stopping times. If $\limsup_{n \to \infty} T_n$ is finite, then it is a stopping time

Published on 27 Mar 2026 - 8:46

score 123 · Answer 15 · 2026-03-27 13:47:38

123

Views

Find all the primes s.t.: $\phi\left(q^3\right)-2\phi\left(q^2\right)=q+3$

Published on 27 Mar 2026 - 13:47

List Question

Prove that if rref of matrix $\bf (v_1\space v_2 \space \cdots v_m)$ has row of zeroes, vectors $\bf v_1,\cdots v_m$ do not span $\mathbb R^{n}$

Proving Division Rings of $p^2$ Elements are Fields

Last step in a simple proof:

Question on the task: Prove $f(x)=\frac{e^x-1}{x}$ is (dis)continuous at $x=0$.

Given $\alpha_{i}$ as well as $\beta_{i}$, is there a linear transformation such that $T(\alpha_{i}) = \beta_{i}$?

Statements with symmetric difference - equality proof.

Find the slope of the graph of $xy-4y^2=2$ at $(9,2)$

Complex number inequality $n^2-(\Re(z^2+z^4+...+z^{2n}))^2\geq (\Im(1+z^2+...+z^{2n}))^2$

Proving recurrence relations using induction

Unique solution to ODE for $y'(t) = f(t, y(t))$ where $f$ is not continuous

Can someone verify this Fourier series calculation?

$T\in \mbox{End}(V)$. If $p|m_T,$ then there is a vector $v$ such that the minimal polynomial of $v$ is exactly $p$.

Counter intuitive Prior/Posterior relationship in Bayesian inference for estimated probability fusion

Let $(T_n)$ be a sequence of stopping times. If $\limsup_{n \to \infty} T_n$ is finite, then it is a stopping time

Find all the primes s.t.: $\phi\left(q^3\right)-2\phi\left(q^2\right)=q+3$

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