Maths Set

Oh no, L is away to Uni to do maths and he has left his protractor at home. I wonder if he needs it for Combinatorics,

Not pictured, there is also a sharpener, rubber, and compasses in the wee box and I don't recall how it has ended up on my desk, but thank goodness it did.
It has been a rubbish day of errands and desk chores and I had run out of blip options.

Thank you very much for the kind comments for the Boat and Ben blip yesterday.  

Combinatorics: the branch of mathematics dealing with combinations of objects belonging to a finite set in accordance with certain constraints, such as those of graph theory.