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...	...	@@ -77,14 +77,19 @@ The command \substitute is used for the evaluation of a function and for the com
77	77	Here are two examples for the evaluation of a function:
78	78	### Example evaluation of a function
79	79	```LaTeX
80		-% field is real
81		-
82	80	\number{a}{1}
83	81	\function{f}{2*x^2 -1} % defines a function f of the variables x
84	82	\substitute[normalize]{f(1)}{f}{x}{a} % evaluation at x=1.
85	83	```
86	84	The function $$f(x) = 2x^2 - 1$$ evaluated at $$x=2$$ yields $$f(1) = 7$$
87	85
	86	+```LaTeX
	87	+\number{a}{1}
	88	+\function{f}{2*x^2 -y} % defines a function f of the variables x and y
	89	+\substitute[normalize]{f(1,y)}{f}{x}{a} % evaluation at x=1.
	90	+```
	91	+The function $$f(x,y) = 2x^2 - y$$ evaluated at $$x=1$$ yields $$f(1,y) = 2-y$$
	92	+
88	93	## Composition of two functions
89	94	### Example composition of functions
90	95	```LaTeX
91	96