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What am I doing wrong?

• Subject: [mg2181] What am I doing wrong?
• From: JSNW at msg.ti.com (Jason Welter)
• Date: Fri, 13 Oct 1995 06:22:54 GMT
• Approved: usenet@wri.com
• Distribution: local
• Newsgroups: wri.mathgroup
• Organization: Texas Instruments
• Sender: daemon at wri.com ( )

Kemp[z_] := If[z>5,Kemp=gft[z] + 21,Kemp=gft[z] - 21]
gft[z_] := If[z>5,gft=z^2 + 2,gft=z^2 - 2]
Kemp[4]

SetDelayed::write: Tag Integer in (-14)[z_] is Protected.
$Failed
SetDelayed::write: Tag Integer in 7[z_] is Protected.
$Failed
(-14)[4]