Extracting all the variables from a list of equations?

*To*: mathgroup at smc.vnet.net*Subject*: [mg25482] Extracting all the variables from a list of equations?*From*: ravanrip at yahoo.com (Ryan VanRiper (--))*Date*: Mon, 2 Oct 2000 22:27:01 -0400 (EDT)*Organization*: Honeywell Technology Center, Honeywell Inc.*Sender*: owner-wri-mathgroup at wolfram.com

How would i go about extracting all the variables from a list of inequalities? If i had.. V = {v$233Period > 0, v$234Period == v$233Period, v$236Period <= v$235Period} I would like to get a list that looks like the following.. X = {v$233Period, v$234Period, v$233Period, v$236Period, v$235Period} Then find all the unique elements to give an answer.. Y = {v$233Period, v$234Period, v$236Period, v$235Period}

**Follow-Ups**:**Re: Extracting all the variables from a list of equations?***From:*Daniel Lichtblau <danl@wolfram.com>