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Precedence

• To: mathgroup at smc.vnet.net
• Subject: [mg60271] Precedence
• From: "Xerxes" <Xerxes314 at gmail.com>
• Date: Fri, 9 Sep 2005 04:07:12 -0400 (EDT)
• Sender: owner-wri-mathgroup at wolfram.com

Hi all,

I've been writing a package using Mathematica to do lattice
perturbation theory. As a part of my package, I'd like to
define my own matrix multiplication, which I call dotm. Since
CenterDot looks pretty and has no previous assignment, I've
used it as both the input and output format of dotm. However,
I run into problems when I try to type things like

Y[x].g A[x].Y[x+a]

where the . should be imagined to be CenterDot. Because the
precedence of the . is higher than the precedence of the
multiplication, this gives (Y.g)(A.Y) instead of Y.(gA).Y.

I know I can attach a TagBox to the CenterDot to force it to
have lower precedence, but that ruins the convenience of typing
esc-.-esc to get the dot. Is there some other way to teach
Mathematica to use a lower precedence?

Xerxes