Jan 3 2012

Snow White

Surely not this ugly girl...

For those of you who doesn’t know Linear Algebra (yet…), the matrix on the blackboard is a reflection matrix, when multiplying with a \mathbb R^{2} vector, the matrix will change the sign of the x coordinate, therefor it will create a reflected image of the vector.


Jan 2 2012

Q wants to break free!

God knows got to make it on my own. So baby can't you see, I've got to break free.

Today in Algebraic structures class we’ve learned about free groups. And learned that \mathbb Q (the rationals) is not a free group…

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Nov 15 2011

The road to hell is paved with good intentions

The following “joke” is in Hebrew because it doesn’t translate as well in English. Sorry.

The road to hell is paved with good intentions

Thanks to Ori Katz for the general idea.

Does anyone have a proof for that?