Texas Instruments TI-89 Manual Book page 31

curvatur
(expression, var)
Returns the curvature of
Use F2 5:Curvature
and example for this function.
div
(exprList, varList)
Returns the rectangular Cartesian
of the vector represented by
coordinate variables in
Use F5 2:Divergence
and example for this function.
Note
erf
(complexNumber)
Returns the approximate numeric error function of
complexNumber
Use F6 1:Error Function, erf
dialog box and example for this function.
erfc
(complexNumber)
Returns the approximate complementary error function of
complexNumber
TI-89 / TI-92 Plus Calculus Tools
to display the problem-entry dialog box
VarList
to display the problem-entry dialog box
The number of components in exprList must equal the
number of variables in varList.
.
.
with respect to
expression
-dimensional divergence
n
with respect to the
exprList
.
to display the problem-entry
.
var
n
Page 31