src/ZF/AC/HH.thy
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(*  Title:      ZF/AC/HH.thy
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    ID:         $Id$
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    Author:     Krzysztof Grabczewski
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The theory file for the proofs of
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  AC17 ==> AC1
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  AC1 ==> WO2
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  AC15 ==> WO6
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*)
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HH = AC_Equiv + Hartog + WO_AC + Let +
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consts
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  HH                      :: [i, i, i] => i
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defs
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  HH_def  "HH(f,x,a) == transrec(a, %b r. let z = x - (UN c:b. r`c)
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                        in  if(f`z:Pow(z)-{0}, f`z, {x}))"
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end
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