Categories at Coimbra
Here's to the dual of each category
If you can't compute you soon will be sorry
For duals and adjoints are everywhere found
And commutative diagrams soon will abound.
Sam Eilenberg said just one paper will do
To introduce categorical notions so new
We'll write it so well these ideas for to sell
And publish it promptly the story to tell.
Categories now flourish in North Portugal
We learn new ideas and constructs so swell
Coimbra's the scene of a categorist dream
Where all new results can appear in full gleam.
Saunders Mac Lane (read at the Conference Dinner)
Pictures by Jürgen Koslowski
Pictures by Vaughan Pratt (SCTA Picnic at Figueira da Foz)