Lyrics:

Van Kampen's my champion
My one saving grace
The fundamental sentinel
Of my topological space
His product are free
His quotients inclusive
No strings attached (unless they're loops)
Just go ahead and use it
Just use it

Mayer-Vietoris
Thus goes the chorus
Pick your subsets wisely
Like a sphere or a torus
Construct a sequence
A long one to be exact
Work out the homology
From your induced maps

Poincaré
My Henri Poincaré
Your duality
Makes cohomology
Have wondrous symmetry
Assuming orientability
With respect to our ring

Chorus x2

Dan Berlyne

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