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Macaulay2
>
The Macaulay2 language
>
operators
>
#?
#? -- check for presence of elements
See also
#
-- length, or access to elements
Ways to use
#?
:
BasicList #? ZZ
-- check for element in list
Database #? String
-- check for value in database
HashTable #? Thing
-- check for value in hash table
Set #? Thing
-- test set membership
String #? ZZ
-- check for character in string
For the programmer
The object
#?
is
a
keyword
.