Differential Operator

Summary:
The gradient of a scalar field f gives the direction and steepness of the slope of f at a given point.
The divergence of a vector field F indicates how F behaves like a source or a sink at a given point.
The curl of a vector field F gives the direction and magnitude of the rotation of F at a given point.

You can define functions using these operators:
+	-	*	/	^
abs( )	sqrt( )	ln( )	exp( )	pi
	sin( )	cos( )	tan( )
	asin( )	acos( )	atan( )
	sinh( )	cosh( )	tanh( )