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Jan 24, 2023 at 11:57 comment added Paul Woolfer @StanleyYaoXiao Oh, thank you. So if I take an arbitrary quadratic form of the same discriminant as $x^{2}-dy^{2}$ and find the number of representations of $N$ by both up to $GL_{2}(\mathbb{Z})$-equivalence then is it going to be the same number?
Jan 23, 2023 at 15:53 comment added Stanley Yao Xiao What you call $F(M,d)$ is more or less completely understood; see for example these notes by Andrew Granville: dms.umontreal.ca/~andrew/Courses/Chapter4.pdf
Jan 23, 2023 at 9:50 comment added Paul Woolfer @StanleyYaoXiao Yes, you're right. Do you know, by chance, any good papers on the way this number of representations is counted? I want to have a deeper understanding.
Jan 23, 2023 at 1:54 comment added Stanley Yao Xiao If I am understanding correctly, are you asking for the number of representations of $N$ by $f$ up to $\text{GL}_2(\mathbb{Z})$-equivalence? If so, then this is basically just the divisor function on $N$ provided that all of the prime factors of $N$ either split in the quadratic field or have even multiplicity.
S Jan 22, 2023 at 22:59 review First questions
Jan 23, 2023 at 3:27
S Jan 22, 2023 at 22:59 history asked Paul Woolfer CC BY-SA 4.0