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problem with"Re" syntax

• To: mathgroup at smc.vnet.net
• Subject: [mg116766] problem with"Re" syntax
• From: tarun dutta <tarunduttaz at gmail.com>
• Date: Sat, 26 Feb 2011 06:09:28 -0500 (EST)

c[i_][t] = a[i][t] + I*b[i][t];
d[i_][t] = g[i][t] + I*h[i][t];
del = Together[Sum[Sqrt[i]*d[i - 1][t]*d[i][t], {i, 0, 5}]]
Re[del]

the problem is that after executing the program, as output I am not
able to get only the real part of the expression(del).the output
contains the whole expression though i am using "Re" term.

some valuable insight will be much appreciated.
regards,
tarun