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HELP FOR: GRTensorII commands
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SYNOPSIS:

The following is a list of GRTensorII commands. The individual help pages for
each command describe their use.

Calculation:
	grcalc()	- calculate the components of a tensor
	gralter()	- simplify/modify tensor components
	grmap()		- apply a MapleV function to the components of a tensor
	grcalc1()	- calculate a single component of a tensor
	grcalcalter()	- calculate and apply simplification
	grtransform()	- perform a coordinate transformation on a metric
	grnormalize()	- normalize a vector/1-form for a given basis
	nptetrad()	- create a null tetrad from a metric

Output:
	grdisplay()	- display the components of an object
	grcomponent()	- access a particular component of an object
	grarray()	- place a 2-index tensor into a MapleV array
	grapply()	- apply a MapleV function without altering a tensor

Manipulation of output:
	gralter()	- simplify/modify tensor components
	grmap()		- apply a MapleV function to the components of a tensor
	grcomponent()	- access a particular component of an object
	grDalias()	- apply derivative aliases to tensor components
	diffAlias()	- apply derivative aliases to tensor components
	autoAlias()	- apply derivative aliases to tensor components
	greqn2set()	- return components of a tensor equation as a set
	grnewmetric()	- create a new metric from a 2-index tensor
	grapply()	- apply a MapleV function without altering a tensor

Defining new objects:
	grdef()		- define a new calculable object
	grdefine()	- define a new object (superceded by grdef())
	grundef()	- clear an object definition
	grundefine()	- clear an object definition (identical to grundef())

Initialization:
	grtensor()	- print version number and load init file(s)
	makeg()		- specify a metric/basis/null-tetrad
	qload()		- load a metric from the default directory
	groptions()	- display global option settings
	grmetric()	- change default metric to name
	grclear()	- clear the results of a calculation
	grundef()	- clear an object definition

Working with metrics/bases:
	makeg()		- specify a metric/basis/null-tetrad
	nptetrad()	- create a null tetrad from a metric
	grtransform()	- perform a coordinate transformation on a metric
	grconstraint()	- add/modify constraint equations
	nprotate()	- perform a rotation of null tetrad vectors

Saving/Loading:
	grsaveg()	- save a metric or basis to a file
	qload()		- load a metric from the default directory
	grload()	- load a metric from file from a specified directory
	grlib()		- load a GRTensorII library of additional objects
	grsavedef()	- save an object definition
	grloaddef()	- load an object definition
	grsaveobj()	- save the value of an object
	grloadobj()	- load an object from a file

Miscellanea:
	difftool()	- convert active form of diff() to passive form (*)
	grlimit()	- evaluate the limit of a function at a point (*)
        PetrovReport()  - describe the intermediate calculations in generating
                          the Petrov type of a spacetime.

(*)  requires the grtools library to be loaded, readlib(grtools).

For lists of pre-defined objects see the help pages for
		grt_objects, grt_basis, grt_invars, grt_operators

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