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Introduction In mathematics, a function \( f \) from a set \( X \) to a set \( Y \) is a relation that associates each element of \( X \) with exactly one element of \( Y. \) This page describes the commonly used notation, terminology, and concepts pertaining to functions. Contents Introduction Definition Notation Domain,...

Guess My RGB, the little colour guessing game, just got a small update. This update adds a "Mode" link to the footer which can be used to toggle the game between normal mode and expert mode. The expert mode was introduced as a hidden feature five months ago in the previous release. With the current release, the expert mode no longer...

Real Analysis Meeting time: 19:00 UTC on Saturdays and Sundays usually.† Meeting duration: 40 minutes. Meeting link: susam.net/meet Meeting log: click here Reference book: Real Analysis by John M. Howie (2001) Chapter notes: ch01.html Club channel: ...

Guess My RGB, the little colour guessing game, received a minor update today. This update adds a hidden feature that lets you play the game in expert mode. In this mode, the match percentage for your submitted guess is not shown on the screen. Thanks to @steffahn for suggesting this feature on th Lobsters forum! Visit...