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Hold and Equal
*To*: mathgroup at smc.vnet.net
*Subject*: [mg73715] Hold and Equal
*From*: Murray Eisenberg <murray at math.umass.edu>
*Date*: Mon, 26 Feb 2007 06:12:41 -0500 (EST)
*Organization*: Mathematics & Statistics, Univ. of Mass./Amherst
*Reply-to*: murray at math.umass.edu
How can I produce in an Output cell (under program control) an
expression like the following,
(a+b)^2 = a^2+ 2 a b + b^2
where instead of the usual Equal (==) I get a Set (=), as in traditional
math notation? I want to input the unexpanded (a+b)^2 and have the
expansion done automatically.
Of course, I can try something like the following:
(a+b)^2 == Expand[(a+b)^2])
So how do I convert the == to =? Of course
((a + b)^2 == Expand[(a + b)^2]) /. Equal -> Set
gives a Set::write error. And
(Hold[(a + b)^2 == Expand[(a + b)^2]]) /. Equal -> Set
doesn't actually evaluate the Expand part and leaves the "Hold" wrapper.
--
Murray Eisenberg murray at math.umass.edu
Mathematics & Statistics Dept.
Lederle Graduate Research Tower phone 413 549-1020 (H)
University of Massachusetts 413 545-2859 (W)
710 North Pleasant Street fax 413 545-1801
Amherst, MA 01003-9305
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