List questions from fake-proofs

Published on 29 Mar 2021 - 18:40

152

Views

False proof that $\frac{13}{6}=0$

Published on 31 Mar 2026 - 17:46

84

Views

Sequentially compact set

Published on 10 Apr 2021 - 15:29

276

Views

Prove that if $Ax=0$ and $Bx=0$ iff $A=CB$?

Published on 11 Apr 2021 - 9:57

447

Views

Prove $\text{null}(A) \subseteq \text{null}(BA)$?

Published on 11 Apr 2021 - 12:47

1.9k

Views

Erroneous proof that derivative of function is always continuous

Published on 15 Apr 2021 - 1:49

56

Views

How to proceed further with the following inequality problem that can be used by the arithmetic and geometric inequality theorem

Published on 15 Apr 2021 - 14:41

309

Views

Proof of if $a^2$ is divisible by 4, then a is not.

Published on 19 Apr 2021 - 10:37

77

Views

What is wrong with this proof of $e \le 2$

Published on 19 Apr 2021 - 12:29

191

Views

Ambiguity in deciding upper and lower limits of definite integration while doing substitutions

Published on 01 May 2021 - 8:54

108

Views

A fake proof for a function taking on all reals in any interval

Published on 03 May 2021 - 2:12

52

Views

Contradictory proofs of $ax+by\ge{ay+bx}$ when $a\ge{b}$ and $x\ge{y}$

Published on 03 May 2021 - 15:49

60

Views

When $T_3$ implies first countable?

Published on 04 May 2021 - 1:58

61

Views

How do I find the error within this Fibonacci Sequence proof that is trying to prove that f(5) = 4?

Published on 05 May 2021 - 2:26

146

Views

Can we differentiate a differential equation to determine its order and degree?

Published on 06 May 2021 - 7:05

List Question

Apparent contradiction in integration by substitution

False proof that $\frac{13}{6}=0$

Sequentially compact set

Prove that if $Ax=0$ and $Bx=0$ iff $A=CB$?

Prove $\text{null}(A) \subseteq \text{null}(BA)$?

Erroneous proof that derivative of function is always continuous

How to proceed further with the following inequality problem that can be used by the arithmetic and geometric inequality theorem

Proof of if $a^2$ is divisible by 4, then a is not.

What is wrong with this proof of $e \le 2$

Ambiguity in deciding upper and lower limits of definite integration while doing substitutions

A fake proof for a function taking on all reals in any interval

Contradictory proofs of $ax+by\ge{ay+bx}$ when $a\ge{b}$ and $x\ge{y}$

When $T_3$ implies first countable?

How do I find the error within this Fibonacci Sequence proof that is trying to prove that f(5) = 4?

Can we differentiate a differential equation to determine its order and degree?

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