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type/permlist

check for an permutation in list form

 

Calling Sequence

Parameters

Description

Examples

Calling Sequence

type( expr, 'permlist' )

Parameters

expr

-

anything; any Maple expression

Description

• 

The call type( expr, 'permlist' ) returns true if expr is a permutation of the integers {1,2,...,n}, where n=nopsexpr, and returns false otherwise.

• 

A permutation of {1,2,...,n} is a list whose members are exactly these integer, in which each integer occurs exactly once.

Examples

type1,2,3,'permlist'

false

(1)

type1,2,3,'permlist'

true

(2)

type2,1,3,'permlist'

true

(3)

type2,1,2,'permlist'

false

(4)

type1,2,3,4,'permlist'

false

(5)

See Also

group

type

type,disjcyc

type,partition