Question

Is it wrong to say $ \sqrt{x} \times \sqrt{x} =\pm x,\forall x \in \mathbb{R}$?

score 887 · Answer 1 · 2012-06-15 07:49:41

887

Views

Is it wrong to say $ \sqrt{x} \times \sqrt{x} =\pm x,\forall x \in \mathbb{R}$?

Published on 15 Jun 2012 - 7:49

score 497 · Answer 2 · 2012-06-23 18:25:51

497

Views

Vector Identity and the Scalar Product

Published on 23 Jun 2012 - 18:25

score 1.3k · Answer 3 · 2012-06-25 13:54:00

1.3k

Views

Proof that $\mathbb N $ is finite

Published on 25 Jun 2012 - 13:54

score 3.6k · Answer 4 · 2012-06-29 03:54:26

3.6k

Views

How to disprove this fallacy that derivatives of $x^2$ and $x+x+x+\dots\quad(x\text{ times})$ are not same.

Published on 29 Jun 2012 - 3:54

score 635 · Answer 5 · 2012-07-08 23:08:30

635

Views

Why solving $\dfrac{\partial u}{\partial x}=\dfrac{\partial^2u}{\partial y^2}$ like this is wrong?

Published on 08 Jul 2012 - 23:08

score 368 · Answer 6 · 2012-07-14 10:42:50

368

Views

Where's the problem in this equation? Resulting in $4 = 5$

Published on 14 Jul 2012 - 10:42

score 1.8k · Answer 7 · 2012-07-24 19:40:51

1.8k

Views

The sum of powers of two and two's complement – is there a deeper meaning behind this?

Published on 24 Jul 2012 - 19:40

score 722 · Answer 8 · 2012-07-29 19:28:00

722

Views

Why does a countably infinite dimensional space not have an uncountable chain of subspaces?

Published on 29 Jul 2012 - 19:28

score 884 · Answer 9 · 2012-08-04 11:49:26

884

Views

Why this proof $0=1$ is wrong?(breakfast joke)

Published on 04 Aug 2012 - 11:49

score 1.5k · Answer 10 · 2012-08-06 07:58:41

1.5k

Views

why is $0=0$ not possible?

Published on 06 Aug 2012 - 7:58

score 1.5k · Answer 11 · 2012-08-24 16:56:26

1.5k

Views

What’s bogus about this Strong Induction Proof on weakly decreasing sequence of primes?

Published on 24 Aug 2012 - 16:56

score 3.5k · Answer 12 · 2026-03-26 21:12:19

3.5k

Views

How not to prove the Riemann hypothesis

Published on 26 Mar 2026 - 21:12

score 219 · Answer 13 · 2012-09-03 16:52:19

219

Views

Find the fallacy in the following treatment

Published on 03 Sep 2012 - 16:52

score 746 · Answer 14 · 2012-09-09 00:33:10

746

Views

Possible fake proof of $1= -1$

Published on 09 Sep 2012 - 0:33

score 4.1k · Answer 15 · 2012-09-11 00:53:38

4.1k

Views

Prove $ 1 + 2 + 4 + 8 + \dots = -1$

Published on 11 Sep 2012 - 0:53

List Question

Is it wrong to say $ \sqrt{x} \times \sqrt{x} =\pm x,\forall x \in \mathbb{R}$?

Vector Identity and the Scalar Product

Proof that $\mathbb N $ is finite

How to disprove this fallacy that derivatives of $x^2$ and $x+x+x+\dots\quad(x\text{ times})$ are not same.

Why solving $\dfrac{\partial u}{\partial x}=\dfrac{\partial^2u}{\partial y^2}$ like this is wrong?

Where's the problem in this equation? Resulting in $4 = 5$

The sum of powers of two and two's complement – is there a deeper meaning behind this?

Why does a countably infinite dimensional space not have an uncountable chain of subspaces?

Why this proof $0=1$ is wrong?(breakfast joke)

why is $0=0$ not possible?

What’s bogus about this Strong Induction Proof on weakly decreasing sequence of primes?

How not to prove the Riemann hypothesis

Find the fallacy in the following treatment

Possible fake proof of $1= -1$

Prove $ 1 + 2 + 4 + 8 + \dots = -1$

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