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 ______     _____     _____      ___      ______  
|      \\  |  ___||  |__  //    / _ \\   /_   _// 
|  --  //  | ||__      / //    | / \ ||  `-| |,-  
|  --  \\  | ||__     / //__   | \_/ ||    | ||   
|______//  |_____||  /_____||   \___//     |_||   
`------`   `-----`   `-----`    `---`      `-`'

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Text this: Ramanujan's modular equations and Atkin-Lehner involutions