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This investigation reveals critical points of quasi-modular forms E_2, E_4, and E_6, suggesting implications for their associated polymorphic functions.
We investigate the critical points of the basic (quasi-)modular forms E₂, E₄, and E₆. They occur where some associated polymorphic functions have poles. By an explicit description of these polymorphic functions as conformal maps, one can give an accurate qualitative analysis of the locations of the critical points of E₂, E₄, and E₆.
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Mario Bonk (2025) studied this question.
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