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Find the derised results

• To: mathgroup at smc.vnet.net
• Subject: [mg123688] Find the derised results
• From: é å <shlwell1988 at gmail.com>
• Date: Thu, 15 Dec 2011 04:56:57 -0500 (EST)
• Delivered-to: l-mathgroup@mail-archive0.wolfram.com

{x,y,z,t}.{{x1,y1,z1,t1},{x2,y2,z2,t2},{x3,y3,z3,t3},{x4,y4,z4,t4}}.
{x,y,z,t}

How can I find those terms with x1 in the above result by some
different methods?

• Follow-Ups:
  • Re: Find the derised results
    • From: Bob Hanlon <hanlonr357@gmail.com>