In Maple 8, the question mark character (?) can appear in identifiers, after the first character, without enclosing the symbol in left single quotes.

test?;

$\mathrm{test?}$

Maple returns an error if a question mark character appears as the first character in an unquoted identifier.

In Maple 8, the keyword in can also be used as an infix operator, representing the membership relation.

2 in { 1, 2, 3 };

$2\in \left\{1\,2\,3\right\}$

s in S;

$s\in S$

A new inert SetOf operator is recognized by in. It is used to form the extension of a type or property.

evalb( 13 in 'SetOf( integer )' );

$\mathrm{true}$

is( a in 'SetOf( real )' ) assuming a::real;

$\mathrm{true}$

The division procedure $\mathrm{`/`}$, when called as a function, now accepts 1 argument, in which case it returns the reciprocal of that argument. When used as an operator, however, two operands are still required.

s / t;

$\frac{s}{t}$

`/`( s, t );

$\frac{s}{t}$

`/`( t );

$\frac{1}{t}$