This is documentation for Mathematica 6, which was
based on an earlier version of the Wolfram Language.
 Mathematica Tutorial

# Other Mathematical Notation

Mathematica supports an extremely wide range of mathematical notation, although often it does not assign a pre-defined meaning to it. Thus, for example, you can enter an expression such as x y, but Mathematica will not initially make any assumption about what you mean by .
Mathematica knows that is an operator, but it does not initially assign any specific meaning to it.
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 This gives Mathematica a definition for what the operator does.
Now Mathematica can evaluate operations.
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A few of the operators whose input is supported by Mathematica.

Mathematica assigns built-in meanings to and , but not to or .
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There are some forms which look like characters on a standard keyboard, but which are interpreted in a different way by Mathematica. Thus, for example, \[Backslash] or \ displays as \ but is not interpreted in the same way as a \ typed directly on the keyboard.
The \ and characters used here are different from the \ and ^ you would type directly on a keyboard.
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Most operators work like and go in between their operands. But some operators can go in other places. Thus, for example, < and > or \[LeftAngleBracket] and \[RightAngleBracket] are effectively operators which go around their operand.
The elements of the angle bracket operator go around their operand.
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Some additional letters and letter-like forms.

You can use letters and letter-like forms anywhere in symbol names.
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is assumed to be a symbol, and so is just multiplied by a and b.
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