Enjoy some of these math quotes and jokes!

Mathematics is made of 50 percent formulas, 50 percent proofs, and 50 percent imagination. 

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"A mathematician is a device for turning coffee into theorems" (P. Erdos)
Addendum: American coffee is good for lemmas. 

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An engineer thinks that his equations are an approximation to reality. A physicist thinks reality is an approximation to his equations. A mathematician doesn't care. 

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Old mathematicians never die; they just lose some of their functions. 

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Mathematicians are like Frenchmen: whatever you say to them, they translate it into their own language, and forthwith it means something entirely different. -- Goethe 

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Mathematics is the art of giving the same name to different things. -- J. H. Poincare

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What is a rigorous definition of rigor? 

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There is no logical foundation of mathematics, and Gödel has proved it!