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Results tagged with nt.number-theory
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user 43442
Prime numbers, diophantine equations, diophantine approximations, analytic or algebraic number theory, arithmetic geometry, Galois theory, transcendental number theory, continued fractions
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isogeny and congruence subgroup
The image in $\text{PSL}_2(\mathbb{Q})$ of a congruence subgroup of $\text{SL}_2(\mathbb{Q})$ need not be a congruence subgroup (hence doesn't contain one).
Incidentally, for any reductive group $G$ …
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