A problem aobut greek variable

• Subject: A problem aobut greek variable
• From: Wang Yuheng
• Date: Thu, 23 Nov 2006 11:42:14 +0800

Code:
(%i1)eq:'diff(%phi,t);
(%o1)0

Why? If I raplace '%phi' by a latin letter such as 'f', it displays:
(%i2)eq:'diff(f,t);
(%o2)  df
      ----
       dt
Why?

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