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1. I had a tutor who could memorise and compute the product of any two given 4 by 4 matrices with, lets say, one digit integral entries. oesn't sound that hard but just try it... I found 3x3 hard enough.

In terms of maths problems - I always try and just think about stuff in my head - a lot of the time writing things down doesn't help until you have worked out how to solve the problem.
2. (Original post by Jake22)
I had a tutor who could memorise and compute the product of any two given 4 by 4 matrices with, lets say, one digit integral entries. oesn't sound that hard but just try it... I found 3x3 hard enough.

In terms of maths problems - I always try and just think about stuff in my head - a lot of the time writing things down doesn't help until you have worked out how to solve the problem.
In my experience though, there are some questions where the proof just ... writes itself. But if I try to think it through without writing anything down I get stuck.
3. Yeah, once I solved 5 + 4 without using my fingers.
4. My friend tried that once. He literally spontaneously combusted.
5. I can't do this, my brain doesn't have enough RAM

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Updated: December 7, 2010
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