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problem with sovlign aquation with argument x/w

• To: mathgroup at smc.vnet.net
• Subject: [mg111184] problem with sovlign aquation with argument x/w
• From: SNC <snc at irc.pl>
• Date: Fri, 23 Jul 2010 07:09:58 -0400 (EDT)

How can i solve equation of type -d^2/dx^2\psi(x/2)=1/4psi(x/2), the
problem is i cant use x/2 as an argument. Please help.