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.? -- check for presence of elements whose key is a symbol

Description

x.?k -- the same as x#?(global k), tells whether a value is available with x.k.

See also

. -- access to elements whose key is a symbol
#? -- check existence of value in a list, hash table, database, or string

For the programmer

The object .? is a keyword.

The source of this document is in Macaulay2Doc/ov_hashtables.m2:901:0.