First, define a basic operator on a single variable 
and apply it using function notation.
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| (1.1) |
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In this example, empty parentheses denote that the operator returns 
, no matter what the input.
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Note that in 1-D Math input, an operator can always be applied by using function notation. However, in 2-D Math input, when the operator is also of type atomic, you must use the apply command. This is because 
is interpreted as multiplication in 2-D math rather than function application. For more information, including how to change this default behavior, see 2DMathDetails.
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Similarly, this multivariate operator returns 
, no matter what the input.
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Operators can be applied without assigning them a name.
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Operators are distributive.
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Use the composition operator @ to perform operator composition. That is, 
means 
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| (1.16) |
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| (1.17) |
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Repeated composition is entered with the @@ operator. Here, a function is composed with itself.
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| (1.19) |
