# What is this set represent?

1. Mar 10, 2012

### mgsumsums

1. The problem statement, all variables and given/known data

Show I' ideal in Zsqrt(d)
Let I'=I intersection Z (where Z denotes the integers)
I any ideal in Zsqrt(d)

2. Relevant equations

3. The attempt at a solution
I think I' is just the set of integers in Z such that the integer is an ideal of zsqrt(d)
But how is this ideal since if I left or right multiply any element of zsqrt(d) with an element in I' I get an elementary with an imaginary component?
1. The problem statement, all variables and given/known data

2. Relevant equations

3. The attempt at a solution
1. The problem statement, all variables and given/known data

2. Relevant equations

3. The attempt at a solution

2. Mar 10, 2012

### mgsumsums

Problem solved prof made a typo sorry