“Let none ignorant of geometry enter my door”

The famous inscription at the entrance of Plato’s Academy “Μηδείς άγεωμέτρητος είσίτω μον τήν στέγην” (translated as “Let none ignorant of geometry enter my door”) could be considered as the oldest admission requirement for a maths student; the digital modern version could be this maths CAPTHCA:

http://nakedsecurity.sophos.com/2011/03/09/a-complicated-calculus-based-anti-spam-captcha/

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