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How to express continued sum?

• To: mathgroup at smc.vnet.net
• Subject: [mg73423] How to express continued sum?
• From: oicqgogogo at sina.com
• Date: Fri, 16 Feb 2007 00:57:05 -0500 (EST)

I want to know how to get the continued sum expression by mathematica?
Such
as:
sigma(x=0..20)sigma(y=0..20)sigma(z=0..20)f(x,y,z)

Thanks!