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how can I solve a function Erfc

• To: mathgroup at smc.vnet.net
• Subject: [mg48396] how can I solve a function Erfc
• From: montgermont.aude at ec-lille.fr (aude)
• Date: Fri, 28 May 2004 00:50:23 -0400 (EDT)
• Sender: owner-wri-mathgroup at wolfram.com

Hi,

I have to solve this function:

Erfc[L/(4*(Dg*t)^(1/2))]= 0.9

Dg is constant.

Dg=5*10^5

I want to plot t as a function of L.

thanks.

aude