Inserting symbols in an equation using keys

Keyboard Shortcut to Equation Editor Commands. Inserting symbols in an equation using keys. Many symbols can be inserted using a CTRL+K, character sequence. To insert Representing Press CTRL+K, Infinity I Arrow A (or) Less than or equal to < (or >) Times T (Not) Element of E (SHIFT+E) (Not) Contained C (SHIFT+C) ................
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