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Maxwell can get invalidated. Math can't.

Ahem. Russell paradox.

Granted it's been a while, but one can never be too careful.

For the truly paranoid only:

Witness the evolution of 'V-E+F=2' since Euler's time:

Is it right? Is it wrong? What does it mean to even BE a 'face' ?

Although I guess the worst thing that could happen in this situation is you change your explanation of the tattoo, and not the tattoo itself.