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Interesting failure of Collect
*To*: mathgroup at smc.vnet.net
*Subject*: [mg61307] Interesting failure of Collect
*From*: "Blimbaum, Jerry CIV NSWC PC" <jerry.blimbaum at navy.mil>
*Date*: Fri, 14 Oct 2005 22:22:38 -0400 (EDT)
*Sender*: owner-wri-mathgroup at wolfram.com
Given the expr = Sin[p]/(4 Pi a) + Sin[p]/(4 Pi b)
and then applying the command
Collect[expr, Sin[p]/(4 Pi)] works as it should, however,
expr2 = Sin[p]/(4 Pi a) - Sin[p]/(4 Pi b)
leaves the expression untouched. (I realize I could use Simplify but
this problem occurred on a much longer expression and this is intended
just to convey the basic idea)....for longer expressions the Collect
process works for all quantities with a + sign but the one with a minus
sign will not be collected.....strikes me as a "bug".....
thanks....jerry blimbaum
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