<boolean>

Type: <boolean>

The boolean type is composed of two objects: #t and #f.

#t means "true"

#f in this context means "false"

All predicates return one of these.

#f is also returned in some fashion or other by many other procedures, where it often means "unspecified". It still tests as a boolean in these cases; this is merely a matter of convention.

See also: not, any