Changes in version 1.0-25 (2023-12-06)                 

    o   fix small bug in closure.c (error() wrongly called)

                 Changes in version 1.0-24 (2023-03-07)                 

    o   add missing methods in NAMESPACE

                 Changes in version 1.0-23 (2023-03-04)                 

    o   Fix formals mismatch in .as.list.gset()

                 Changes in version 1.0-22 (2023-02-01)                 

    o   Add ORCID IDs

                 Changes in version 1.0-21 (2022-02-09)                 

    o   Vectorize all [cg]set predicates and check for correct
	arguments

    o   add as.vector() methods for [cg]sets

    o   rename element class to gset_element to avoid name clash with
	ggplot

                 Changes in version 1.0-20 (2021-12-08)                 

    o   Some small fixes in interval code

    o   [gc]set_complement(a, b) now use the union of the universes of
	a and b, and the max. bound of a and b if no global defaults
	are specified.

                 Changes in version 1.0-19 (2021-10-11)                 

    o   no user-level changes

                 Changes in version 1.0-18 (2017-12-12)                 

    o   Do not export as.list.function() any more

                 Changes in version 1.0-17 (2017-03-07)                 

    o   add lengths method

    o   the extract operator ([[) now returns NULL if the requested
	element can not be found instead of throwing a cryptical error
	message

    o   some small internal optimizations

                 Changes in version 1.0-16 (2015-10-11)                 

    o   no user-level changes

                 Changes in version 1.0-15 (2015-07-08)                 

    o   add import statements for functions in recommended packages to
	NAMESPACE

                 Changes in version 1.0-14 (2015-04-30)                 

    o   internal fix because nchar(NA) now returns NA

                 Changes in version 1.0-13 (2013-03-19)                 

    o   Rd improvements

                 Changes in version 1.0-12 (2012-11-13)                 

    o   small fix in LABELS() (when called with NULL)

                 Changes in version 1.0-11 (2012-09-02)                 

    o   Author/Maintainer info removed from DESCRIPTION

                 Changes in version 1.0-10 (2012-08-27)                 

    o   The length() methods for [cg]sets are no longer aliases for
	gset_cardinality(), but for set_cardinality() (i.e., give the
	number of elements in the [cg]set).  This change has been made
	since length() methods are expected to yield integer values
	only.

                 Changes in version 1.0-9 (2012-03-29)                  

    o   small bug fix in fuzzy_two_normals()

                 Changes in version 1.0-8 (2012-01-24)                  

    o   Package news converted to Rd format.

                 Changes in version 1.0-7 (2010-08-30)                  

    o   small fix in interval code

                 Changes in version 1.0-6 (2010-04-11)                  

    o   small fix in all.equal() method

                 Changes in version 1.0-5 (2010-04-11)                  

    o   bug fix in all.equal() method

    o   overloaded set operators will now work for operands of mixed
	set types

                 Changes in version 1.0-4 (2010-02-14)                  

    o   as.list.interval() now returns a list of intervals instead of
	just applying unclass()

                 Changes in version 1.0-3 (2010-02-10)                  

    o   small bug fixes

                 Changes in version 1.0-2 (2009-12-22)                  

    o   small bug fixes

                 Changes in version 1.0-1 (2009-11-06)                  

    o   interval class for possibly infinite numeric intervals added.

    o   fuzzy rules now accept the use of brackets in the expressions.

    o   Missing memberships are now supported.

                  Changes in version 1.0 (2009-08-04)                   

    o   JSS article as vignette added.

    o   fuzzy_pi4() generator added.

    o   [gc]set_memberships extended to allow for filter elements and
	to work with tuples.

                  Changes in version 0.7 (2009-05-24)                   

    o   L1 and L2 dissimilarities for fuzzy multisets added.

    o   fuzzy_pi() generator added

    o   (fuzzy) multisets are now n-bounded (where n is the maximal
	multiplicity).  This now allows consistent complement-building.

    o   nu-cuts added (filters elements according to multiplicity).

                  Changes in version 0.6 (2009-02-10)                   

    o   fuzzy inference framework added

    o   converters for matrices added

                  Changes in version 0.5 (2009-01-21)                   

    o   bug fixes in ordering function and as.character.cset()

                  Changes in version 0.4 (2008-11-28)                   

    o   fuzzy function generators added

    o   extended plotting for fuzzy sets added

    o   several functions for memberships transformation added

    o   performance of matching operator improved

    o   optional universes for gsets added

                  Changes in version 0.3 (2008-08-11)                   

    o   support for customizable sets (cset) added

                 Changes in version 0.2-1 (2008-07-30)                  

    o   set_options() added

                  Changes in version 0.2 (2008-07-10)                   

    o   A _lot_ of bug fixes

    o   closure and reduction of sets added

                  Changes in version 0.1 (2007-10-16)                   

    o   Initial release, implementing data structures and methods for
	ordinary sets, generalized sets (fuzzy sets, multisets, fuzzy
	multisets) as well as support for fuzzy logic.