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Erf[InverseErf] -- making a function and its inverse cancel

• To: mathgroup at smc.vnet.net
• Subject: [mg68998] Erf[InverseErf] -- making a function and its inverse cancel
• From: mktippett at gmail.com
• Date: Sat, 26 Aug 2006 02:04:40 -0400 (EDT)
• Sender: owner-wri-mathgroup at wolfram.com

How can I get an expression like Erf[InverseErf[0,1/3]] to simplify to
1/3?

Cos[ArcCos[1/3]] gives 1/3. Is there some assumption that I'm missing?

thanks,
Mike