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What is this notation for?

Posted: Tue Sep 30, 2014 12:36 am
by huayualice
This is a True or False question:

Q[sqrt10] belongs to Q[sqrt2, sqrt5].

Does Q[sqrt2, sqrt5] mean, all numbers of the form a+b*sqrt2+c*sqrt5, with a,b, c in Q?

Also, can someone point me to a guide on how to type things like sqrt, integral sign, etc on this forum?

Thank you!