What’s your favorite equation?

It has been a while since we had a survey on any mathematics topic, so today I’d like to kick one off. What’s your favorite equation, formula, identity or inequality?

Try to keep it to your top 5 so that things don’t get out of hand – but please share which equation, formula, identity or inequality amuse you the most.

So – What’s your favorite equation, formula, identity or inequality in mathematics and if possible tell us why? Over to you!

Take into consideration all the branches of mathematics

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