∂ Campbell’s

https://isomorphismes.files.wordpress.com/2013/04/04837-tomatocam.jpg

Cylinder = line-segment × disc

C = | × ●

The “product rule” from calculus works as well with the boundary operator as with the differentiation operator .

∂C  =   ∂| × ●   +   | × ∂●

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>Oops. Typo. Sorry, I did this really late at night! cos and sin need to be swapped back.

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Oops. Another typo. Wrong formula for circumference.

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