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    • CommentRowNumber1.
    • CommentAuthorUrs
    • CommentTimeApr 10th 2014

    some basics at congruence subgroup

    • CommentRowNumber2.
    • CommentAuthorUrs
    • CommentTimeApr 22nd 2014

    added a paragraph Relation to spin strutcures on elliptic curves on how over the complex numbers the congruence subgroup Γ 0(2)\Gamma_0(2) is the one that fixes the “NS-R” spin strutcure on the elliptic curve.