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Sigma KEE - NullList
KB Term: 
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
null list
The List that has no items. The uniqueness of NullList follows from the extensionality of Lists, i.e. the fact that two Lists with the same items in the same order are identical.
Relationships      
InstancesabstractProperties or qualities as distinguished from any particular embodiment of the properties/qualities in a physical medium. Instances of Abstract can be said to exist in the same sense as mathematical objects such as sets and relations, but they cannot exist at a particular place and time without some physical encoding or embodiment.
 entityThe universal class of individuals. This is the root node of the ontology.
 listEvery List is a particular ordered n-tuple of items. Generally speaking, Lists are created by means of the ListFn Function, which takes any number of items as arguments and returns a List with the items in the same order. Anything, including other Lists, may be an item in a List. Note too that Lists are extensional - two lists that have the same items in the same order are identical. Note too that a List may contain no items. In that case, the List is the NullList.
Belongs to Class entity


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