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there is.

Please.

You mean for pyramids?

The base of a cube has 4 sides but it has 4+2 faces..
I didn't get it!

Oops, yes, pyramids.

Yeah... but I am asking for a solid proof.

@ParthKohli needs a proof involving serious 'mathematics'

For a pentagonal prism:
|dw:1350485379807:dw|

Pfft, drawing pictures is serious enough for me.

Oh Lord, a solid proof.

LOL, I get it.

Induction?

Well, @CliffSedge , your diagram says it all...

I need serious mathematics, sire, serious mathematics.

Euler's formula might come into play if you want to get all fancy about it.
V-E+F=2

to prove something, you need an equation

And that formula is valid also for a cube!!