You could quantify your knowledge of maths by giving the year of development of the most recent theory you have mastered. (One's "theory year".) In mechanics, I have covered Lagrangians quite well, so my mechanics year is 1783.*

Aggregate scores are much less meaningful, but I am inclined to be brutal and set one's overall theory year as the

*oldest*year among your knowledge of the big trunk branches (geometry, algebra, Analysis, number theory, combinatorics, groups, logic...).

My mate Johnny points out a couple of problems here:

- Most mathematicians are so specialised that they'd have a TY of 2013 for one thing and 1800 for everything else. Your metric shouldn't have a low score for the greatest actual proponents.

*Response*: theory year was made for omniscients, not for man. - Mathematics itself gnaws at your concept: for Category theory promises to make all areas equivalent. So one very high TY, + 1945 in topology could theoretically give you an overall very high TY.

*Response*: Prove it.

* This doesn't look very good, but better when you consider that almost everyone is < -1800.

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