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   _____     ___     __   __     ___      _____   
  / ___//   / _ \\   \ \\/ //   / _ \\   / ____|| 
  \___ \\  | / \ ||   \   //   / //\ \\ / //---`' 
  /    //  | \_/ ||   / . \\  |  ___  ||\ \\___   
 /____//    \___//   /_//\_\\ |_||  |_|| \_____|| 
`-----`     `---`    `-`  --` `-`   `-`   `----`

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