I've bought my brother a large blackboard for his birthday; it's to go in his room for 'stuff'. However he'd talked about getting it decorated and at the moment is keen on having some sort of equation (in paint) down the side or along the top.
Does anyone have any suggestions of pretty/artistic equations? Personally I'm quite a fan of integrals (the symbol at least) but open to all suggestions. I think he's considering a 'beautiful mind' type angle.
ps he's a linguist and doesn't know maths so this is artistic merit only
