Re: Intersection problem

*To*: mathgroup at smc.vnet.net*Subject*: [mg125973] Re: Intersection problem*From*: "Harvey P. Dale" <hpd1 at nyu.edu>*Date*: Wed, 11 Apr 2012 18:14:57 -0400 (EDT)*Delivered-to*: l-mathgroup@mail-archive0.wolfram.com*References*: <201204100627.CAA10654@smc.vnet.net>

Cisco: Select[{{a,x},{b,y},{c,z}},MemberQ[#,(b|c|d)]&] Best, Harvey -----Original Message----- From: Cisco Lane [mailto:travlorf at yahoo.com] Sent: Tuesday, April 10, 2012 2:27 AM To: mathgroup at smc.vnet.net Subject: [mg125973] Intersection problem I need to select out the elements of the first list whose first elements are contained in the second list. For example first list: {{a,x},{b,y},{c,z}} second list: {b,c,d} result: {{b,y},{c,z}} Is there a quick way to do this? Intersection, maybe somehow?

**References**:**Intersection problem***From:*Cisco Lane <travlorf@yahoo.com>