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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>