2004-01-12 paulson 2004-01-12 Added lemmas to Ring_and_Field with slightly modified simplification rules Deleted some little-used integer theorems, replacing them by the generic ones in Ring_and_Field Consolidated integer powers
2003-12-03 paulson 2003-12-03 Simplification of the development of Integers
2003-03-20 paulson 2003-03-20 Gauss's law of quadratic reciprocity by Avigad, Gray and Kramer