q.Then

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linear-algebra

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19

What is range of a matrix?

Apr 12, 2017

16

Is $x!-(x-1)!-(x-2)!-...-1!$ always divisible by three?

Dec 26, 2016

7

For integer $n>3$, prove that $n^2+(n+1)^2\ne (n+2)^2$

Dec 26, 2016

5

What is the general solution to $2 \cos^2 x-\cos x=0$?

Jan 3, 2017

5

Why is $v/\|v\|$ not a unit vector?

Apr 23, 2016

Questions

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21

Proof that any linear system cannot have exactly 2 solutions.

Sep 16, 2015

12

mod Distributive Law, factoring $\!\!\bmod\!\!:$ $\ ab\bmod ac = a(b\bmod c)$

Dec 15, 2016

9

Collatz $4n+1$ rule?

Dec 7, 2015

5

Proof of no primes such that $x^2 + y^2 = z^2$

Mar 9, 2015

4

How do I solve $18^{{20}^{19}}$ divided by 7?

Dec 15, 2016

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linear-algebra

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matrices

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elementary-number-theory

25

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10

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change-of-basis

19

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1

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divisibility

17

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2

posts

Reputation

+10

Prove existence of multiplicative inverse modulo p when p is prime

-2

Is this conception of countable vs. uncountable infinity adequate?

+10

Collatz $4n+1$ rule?

+10

mod Distributive Law, factoring $\!\!\bmod\!\!:$ $\ ab\bmod ac = a(b\bmod c)$

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