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I saw a talk that said the branch of Mathematics that dealt with the interconnectedness of Mathematics was called 'Category Theory'. You can see it here: http://vimeo.com/17207564 and Part 2 here: https://www.youtube.com/watch?v=yilkBvVDB_w

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Category theory by Tom LaGatta[1] is also a nice introduction. He suggests taking a look at the nLab website[2], a wiki of Maths and Physics from the categorical point of view.

[1] https://www.youtube.com/watch?v=o6L6XeNdd_k [2] http://ncatlab.org/

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