Here's my favourite version of this proof, in the style of a poem by Dr. Seuss: http://www.lel.ed.ac.uk/~gpullum/loopsnoop.html http://www.lel.ed.ac.uk/~gpullum

Here's my favourite version of this proof, in the style of a poem by Dr. Seuss: http://www.lel.ed.ac.uk/~gpullum/loopsnoop.html http://www.lel.ed.ac.uk/~gpullum/loopsnoop.html