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Choosing branch cuts for elementary function

• To: mathgroup at yoda.physics.unc.edu
• Subject: Choosing branch cuts for elementary function
• From: yip-ken at cs.yale.edu (ken yip)
• Date: Sat, 2 Jan 1993 18:25:03 -0500

Is there a way to override the default branch cuts?  For instance,
how to specify the negative imaginary axis as the branch cut for
Sqrt[z]?