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1 (* Title: ZF/OrderArith.thy |
1 (* Title: ZF/OrderArith.thy |
2 Author: Lawrence C Paulson, Cambridge University Computer Laboratory |
2 Author: Lawrence C Paulson, Cambridge University Computer Laboratory |
3 Copyright 1994 University of Cambridge |
3 Copyright 1994 University of Cambridge |
4 *) |
4 *) |
5 |
5 |
6 header{*Combining Orderings: Foundations of Ordinal Arithmetic*} |
6 section{*Combining Orderings: Foundations of Ordinal Arithmetic*} |
7 |
7 |
8 theory OrderArith imports Order Sum Ordinal begin |
8 theory OrderArith imports Order Sum Ordinal begin |
9 |
9 |
10 definition |
10 definition |
11 (*disjoint sum of two relations; underlies ordinal addition*) |
11 (*disjoint sum of two relations; underlies ordinal addition*) |