# (Co)homology: A Poem

I was recently (avoiding doing my homology homework by) reading through some old poems by Shel Silverstein, author of The Giving TreeA Light in the Attic, and Falling Up to name a few. Feeling inspired, I continued to procrastinate by writing a little poem of my own - about homology, naturally!

## Cohomology

Homology, homology,
I’ve become rather quite fond of thee.
From $\pi_n$ an oasis, counting holes in weird spaces,
you’re such a great part of topology!

Homology, homology,
although I only know of three:
simplicial to singular, the third is called cellular,
they're all just making me so happy.

Homology, homology,
labeling things up to homotopy.
With Mayer and Vietoris, no van-Kampens on your list,
you've the right smidgen of group theory.

Homology, homology,
“What’s that?” I ask, “What’s this I see?”