Re: How to get rid of irrelevant Boolean variables from an expression
- To: mathgroup at smc.vnet.net
- Subject: [mg94858] Re: How to get rid of irrelevant Boolean variables from an expression
- From: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>
- Date: Mon, 29 Dec 2008 06:37:04 -0500 (EST)
- References: <gj55j3$c60$1@smc.vnet.net>
Hi, x && y || ! x && y // LogicalExpand ?? Regards Jens Vlad wrote: > Hi, > > I need to simplify a Boolean expression that looks like > > x && y || !x && y > > to y alone. I.e. the expression's truth value is independent of x so it should be left out. > > I've tried about every Mathematica function for dealing with Boolean expressions and couldn't do this. Also, > > Equivalent[x && y || !x && y, y]//TautologyQ > > gives False. This might be because the two expressions don't have the same number of variables (?). > > I have large truth tables so I would like to get rid of the irrelevant Boolean variables automatically. Does anyone know how to do this? > > Thanks >