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On Presenting Monotonicity and On EA=>AE
Abstract
Two independent topics are treated. First, the problem of weakening/strengthening steps in calculational proofs is discussed and a form of substantiating such steps is proposed. Second, a simple proof of (Ex| R.x: (Ay| S.y: P.x.y)) greater than or equal to (Ay| S.y: (Ex| R.x: P.x.y)) is presented, which uses the idea of a witness for an existnetial quantification.
Date Issued
1995-04Publisher
Cornell University
Subject
computer science; technical report
Previously Published As
http://techreports.library.cornell.edu:8081/Dienst/UI/1.0/Display/cul.cs/TR95-1512
Type
technical report