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Question about x_h

• To: mathgroup at yoda.physics.unc.edu
• Subject: Question about x_h
• From: tntg0367 at uxa.cso.uiuc.edu (Thao N Tran)
• Date: Fri, 18 Oct 1991 16:22:43 GMT

I would like to use "x_h" to do something like:

	newhead /: test[x_newhead] := new

where I would define the head of the symbol somewhere else:

	Head[y] ^= newhead

But this doesn't work.  When I evaluate "test[y]", I get "test[y]"
back.  If I add a line:

	test[x_Symbol] := stillsymbol

then "test[y]" gives "stillsymbol".  So it seems like my "Head"
assignment for the symbol "y" didn't go through.  How can I make
Mathematica understand what I mean?  Thanks for your help.

		Thao Tran
		t-tran at uiuc.edu