author | paulson |
Wed, 19 Jul 2000 12:33:19 +0200 | |
changeset 9391 | a6ab3a442da6 |
parent 9365 | 0cced1b20d68 |
child 10606 | e3229a37d53f |
permissions | -rw-r--r-- |
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(* Title : Real/RealDef.thy |
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ID : $Id$ |
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Author : Jacques D. Fleuriot |
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Copyright : 1998 University of Cambridge |
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Description : The reals |
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*) |
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RealDef = PReal + |
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constdefs |
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realrel :: "((preal * preal) * (preal * preal)) set" |
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"realrel == {p. ? x1 y1 x2 y2. p = ((x1,y1),(x2,y2)) & x1+y2 = x2+y1}" |
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typedef real = "UNIV//realrel" (Equiv.quotient_def) |
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instance |
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real :: {ord, zero, plus, times, minus} |
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consts |
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"1r" :: real ("1r") |
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defs |
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real_zero_def |
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"0 == Abs_real(realrel^^{(preal_of_prat(prat_of_pnat 1p), |
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preal_of_prat(prat_of_pnat 1p))})" |
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real_one_def |
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"1r == Abs_real(realrel^^{(preal_of_prat(prat_of_pnat 1p) + |
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preal_of_prat(prat_of_pnat 1p),preal_of_prat(prat_of_pnat 1p))})" |
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real_minus_def |
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"- R == Abs_real(UN (x,y):Rep_real(R). realrel^^{(y,x)})" |
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real_diff_def "x - y == x + (- y :: real)" |
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constdefs |
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real_of_preal :: preal => real |
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"real_of_preal m == |
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Abs_real(realrel^^{(m+preal_of_prat(prat_of_pnat 1p), |
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preal_of_prat(prat_of_pnat 1p))})" |
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rinv :: real => real |
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"rinv(R) == (@S. R ~= 0 & S*R = 1r)" |
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real_of_posnat :: nat => real |
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"real_of_posnat n == real_of_preal(preal_of_prat(prat_of_pnat(pnat_of_nat n)))" |
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heavily revised by Jacques: coercions have alphabetic names;
paulson
parents:
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real_of_nat :: nat => real |
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"real_of_nat n == real_of_posnat n + (-1r)" |
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defs |
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real_add_def |
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"P + Q == Abs_real(UN p1:Rep_real(P). UN p2:Rep_real(Q). |
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(%(x1,y1). (%(x2,y2). realrel^^{(x1+x2, y1+y2)}) p2) p1)" |
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real_mult_def |
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"P * Q == Abs_real(UN p1:Rep_real(P). UN p2:Rep_real(Q). |
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(%(x1,y1). (%(x2,y2). realrel^^{(x1*x2+y1*y2,x1*y2+x2*y1)}) p2) p1)" |
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real_less_def |
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"P < Q == EX x1 y1 x2 y2. x1 + y2 < x2 + y1 & |
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(x1,y1):Rep_real(P) & |
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(x2,y2):Rep_real(Q)" |
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real_le_def |
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"P <= (Q::real) == ~(Q < P)" |
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end |