Nuprl Lemma : DeMorgan2

[P,Q:].  (((P  Q))  ((P)  (Q)))


Proof




Definitions occuring in Statement :  uall: [x:A]. B[x] prop: not: A implies: P  Q or: P  Q and: P  Q
Definitions :  uall: [x:A]. B[x] member: t  T prop: implies: P  Q and: P  Q not: A or: P  Q guard: {T}
Lemmas :  not_wf or_wf
\mforall{}[P,Q:\mBbbP{}].    ((\mneg{}(P  \mvee{}  Q))  {}\mRightarrow{}  ((\mneg{}P)  \mwedge{}  (\mneg{}Q)))


Date html generated: 2013_09_05-AM-11_13_21
Last ObjectModification: 2013_07_09-PM-01_26_28

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