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1 (* Title: Substitutions/setplus.thy |
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2 Author: Martin Coen, Cambridge University Computer Laboratory |
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3 Copyright 1993 University of Cambridge |
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4 |
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5 Minor additions to HOL's set theory |
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6 *) |
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7 |
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8 Setplus = Set + |
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9 |
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10 rules |
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11 |
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12 ssubset_def "A < B == A <= B & ~ A=B" |
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13 |
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14 end |