If M's a complete metric space

And non-empty, it's always the case

If f's a contraction

Then under its action

Exactly one point stays in place

A dozen a gross and a score

Plus 3 times the square root of 4

Divided by 7

Plus 5 times 11

Is 9 squared and not a bit more

A student of Herr Sophus Lie

Expanded on df/dz

"If you read what I've drawn"

Said Elie Cartan

"You'll find that dL is Ld"

– Adrian Weitzer

The famous logician Frank Plumpton

Ramsey had three pigeons he dumped in

To two holes and knew

That one contained two

Without any further assumption

– Josh Greene

A mathematician named Klein

Thought the Möbius loop was divine

Said he, "If you glue

The edges of two

You get a weird bottle like mine"

Armed with her metal-clad chalk

The brave mathematician had fought

Through pits of snake lemmas

And diagram dilemmas

'Til the long exact sequence was naught

– Me, for my professor

A mathematician confided

The Möbius strip is one-sided

You'll get quite a laugh

If you cut one in half

For it stays in one piece when divided

A question one thinks is empirical

Is whether some shape may be spherical

But Alexander's horned sphere

Might cause one much fear

Its construction quite nearly chimerical

– Adrian Weitzer

The perfidious lemma of Dehn

Was every topologist's bane

'Til Christos D. Pap-

akyriakop-

oulos proved it without any strain

– John Milnor