       preclude mathematical meaning of OverBar etc

• To: mathgroup at smc.vnet.net
• Subject: [mg67382] preclude mathematical meaning of OverBar etc
• From: Martin Schoenecker <ms_usenet at gmx.de>
• Date: Wed, 21 Jun 2006 02:12:47 -0400 (EDT)
• Sender: owner-wri-mathgroup at wolfram.com

```Dear group,

I would like to use OverBar, SuperStar etc. to define characteristic or
modified values for the same, "plain" variable.  Unfortunately, as every
expression, they become a mathematical meaning which is not what I
intend, e.g. for a substitution:

test

In:=
subsfun = u -> Function[{x, t},
OverHat[l]*OverTilde[u][
OverTilde[x][x], OverTilde[t][
t]]]
subsvar = OverTilde[t] ->
Function[t, t/OverHat[t]]
resubsvar = t/OverHat[t] ->
OverTilde[t]

Out=
u -> Function[{x, t}, OverHat[l]*
OverTilde[u][OverTilde[x][x],
OverTilde[t][t]]]

Out=
OverTilde[t] -> Function[t,
t/OverHat[t]]

Out=
t/OverHat[t] -> OverTilde[t]

In:=
D[u[x, t], t]
% /. subsfun
% /. subsvar
% /. resubsvar

Out=
Derivative[0, 1][u][x, t]

Out=
OverHat[l]*Derivative[
OverTilde[t]][t]*
Derivative[0, 1][OverTilde[u]][
OverTilde[x][x], OverTilde[t][t]]

Out=
OverHat[l]*(1/OverHat[t] -
(t*Derivative[OverHat][t])/
OverHat[t]^2)*
Derivative[0, 1][OverTilde[u]][
OverTilde[x][x], t/OverHat[t]]

Out=
OverHat[l]*(1/OverHat[t] -
(t*Derivative[OverHat][t])/
OverHat[t]^2)*
Derivative[0, 1][OverTilde[u]][
OverTilde[x][x], OverTilde[t]]

where I get the derivative of the OverHat term, which is not desired.
How to overcome this?  Is there another possibility than to use
Symbolize with Utilities`Notation`?  Thanks for any hints,

Martin

```

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