MathGroup Archive 2011

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NumberMultiplier usage

  • To: mathgroup at
  • Subject: [mg121857] NumberMultiplier usage
  • From: "tenons at" <tenons at>
  • Date: Wed, 5 Oct 2011 04:00:45 -0400 (EDT)
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Can anyone shed any light on why

Times[3, 2^z]  appears as 3 x 2^z


Times[-3,2^x]  appears as -3 2^z   ?

For presentation purposes (for freshmen!), I would like the
NumberMultiplier to show up in the second case as well.

I realize I can do something like:

Format[Times[x_?(NumericQ[#] && Negative[#] &), z_] := x\[Cross]z]:

but this seems clumsy, a little dangerous, doesn't affect input lines
and produces the result with parentheses which I don't care for:


Does anybody else care about such things?

Michael Williams

[ I have NumberMultiplier set to \[Cross] in all the various *Forms
and the $FrontEnd and AutoMultiplicationSymbol -> True ]

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