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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