What is this notation for?

Forum for the GRE subject test in mathematics.
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Joined: Thu Sep 11, 2014 7:19 am

What is this notation for?

Post by huayualice » Tue Sep 30, 2014 12:36 am

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!

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