Math Proof: 2=1

**Jhevon** · March 6th 2008, 07:03 PM

Originally Posted by ThePerfectHacker

People must die for their false beliefs.

my point is that no one believes the "proofs" here. they're like mathematical jokes... on another level

**JaneBennet** · March 7th 2008, 01:12 AM

Originally Posted by janvdl

Isn't that a bit harsh?

Probably. I tend to be a bit carried away when I post.

Well, my point is that the way we represent certain mathematical concepts in symbols can be misleading. For example, representing the imaginary number i as $\sqrt{-1}$ can mislead us into manipulating equations using rules for $\sqrt{x}$ that only apply only when $x\geq0$ .

**TriKri** · March 7th 2008, 04:28 AM

Originally Posted by ThePerfectHacker

People must die for their false beliefs.

Oh no! What have I done?

**colby2152** · March 7th 2008, 05:28 AM

Originally Posted by TriKri

Oh no! What have I done?

Don't worry, be happy!

**Jhevon** · March 7th 2008, 12:07 PM

Ok, group hug everyone!

our group is Abelian, so it doesn't matter who hugs who in which order, just grab a partner

**topsquark** · March 7th 2008, 02:02 PM

Originally Posted by Jhevon

Ok, group hug everyone!

our group is Abelian, so it doesn't matter who hugs who in which order, just grab a partner

I've got a fiancee already, but I can grab a pretty girl?

-Dan

**angel.white** · March 7th 2008, 06:04 PM

Originally Posted by Jhevon

Ok, group hug everyone!

our group is Abelian, so it doesn't matter who hugs who in which order, just grab a partner

I hug Jhevon first!

Originally Posted by topsquark

I've got a fiancee already, but I can grab a pretty girl?

-Dan

If by "grab" you mean "acquire" for a platonic group hug, then yes. If by "grab" you mean "grope" / "pinch" / "fondle" / "caress" / "stroke" / "pet" or any other activity which could potentially "raise" your "morning sun" then...

only if it's consentual.

**topsquark** · March 7th 2008, 06:06 PM

Originally Posted by angel.white

If by "grab" you mean "acquire" for a platonic group hug, then yes. If by "grab" you mean "grope" / "pinch" / "fondle" / "caress" / "stroke" / "pet" or any other activity which could potentially "raise" your "morning sun" then...

only if it's consentual.

(sighs) Only that kind of detail can come from a Math forum!

-Dan

**janvdl** · March 7th 2008, 10:42 PM

Originally Posted by Jhevon

Ok, group hug everyone!

our group is Abelian, so it doesn't matter who hugs who in which order, just grab a partner

I'm with Topsquark(his idea not him

)... But we only have 1 girl here...

**colby2152** · March 10th 2008, 06:23 AM

Originally Posted by topsquark

I've got a fiancee already, but I can grab a pretty girl?

-Dan

Same here, when is your big date Dan?

**Alfarom** · May 21st 2008, 05:03 PM

Originally Posted by Quick

It hasn't been proven that $\sqrt{-1\cdot-1}=\sqrt{-1}\cdot\sqrt{-1}$

given
Sqrt-1*Sqrt-1

Prove
Sqrt-1*Sqrt-1

Justifications
Sqrt-1=i
therefore: Sqrt-1*Sqrt-1= i^2
Sqrt(-1*-1) = Sqrt-1*Sqrt-1 = i^2
i^2=i^2

if i am correct. i hope

**topsquark** · May 21st 2008, 06:46 PM

Originally Posted by Alfarom

given
Sqrt-1*Sqrt-1

Prove
Sqrt-1*Sqrt-1

Justifications
Sqrt-1=i
therefore: Sqrt-1*Sqrt-1= i^2
Sqrt(-1*-1) = Sqrt-1*Sqrt-1 = i^2
i^2=i^2

if i am correct. i hope

The problem is that
$\sqrt{-1 \cdot -1} = \sqrt{1} = 1 \neq i^2$

You have assumed that $\sqrt{-1 \cdot -1} = (\sqrt{-1})^2$ in the third line of your justification. This is what you were trying to prove.

-Dan

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