modular curve
algebraic curve constructed as a quotient of the complex upper half-plane by the action of a congruence subgroup of the modular group of integral 2×2 matrices
en-GB/ˈmɒdjʊlə ˈkɜːv/
en-US/ˈmɑd͡ʒəlɚ ˈkɝv/
algebraic curve constructed as a quotient of the complex upper half-plane by the action of a congruence subgroup of the modular group of integral 2×2 matrices