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Root's third argument?

• To: mathgroup at smc.vnet.net
• Subject: [mg66220] Root's third argument?
• From: bradc355113 at yahoo.com
• Date: Thu, 4 May 2006 05:21:10 -0400 (EDT)
• Sender: owner-wri-mathgroup at wolfram.com

The Root function seems to have an undocumented third argument--does
anyone know what it represents?

I ran into it while trying to use some replacement rules to replace
Root objects in an expression, and none of my "Root[f_,k_]" patterns
were matching, because Root has an invisible third argument that
doesn't show up in output.

I have a workaround, but I'm still curious.

Thanks,
Brad

• Follow-Ups:
  • Re: Root's third argument?
    • From: Andrzej Kozlowski <akoz@mimuw.edu.pl>