jim; Thanks; I had a feeling there was something dodgy about my maths as I typed it, anyway it would be quite a turn up for the books.
PS, so what % increase is 0 to 1 ? or is it not assessable
Incidentally ref. Maths, I read Charles Moore the other day saying he asked three "very eminent" mathematicians to define it what it was and he got different answers, it ended inconclusively, I remember one said it was a 'sort of logic'.
I know to the Greeks (ancient!) the subject had a muse and was one of the arts.
Sorry to stray TTT