Classical modular curve: Difference between revisions

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is PGL<sub>2</sub>(p), the [[projective linear group|projective general linear group]] of [[Möbius transformationstransformation|linear fractional transformations]] of the [[projective line]] of the field of p elements, which has p+1 points, the degree of X<sub>0</sub>(p).
 
This extension contains an algebraic extension