I’ve being looking at finding integral bases and particularly at question 6 on the third homework sheet. I’m looking for a integral basis for I understand that will replace in to form an integral basis but I don’t understand how to get to it. It seems too long winded to try every possible value for until I find one which is a algebraic integer. What am I missing?

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Reply:

On the course webpage, check the document `An example of an integral basis.’

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