@article {urbaniak2006ontological,
	title = {On Ontological Functors of {L}esniewski{\textquoteright}s Elementary Ontology},
	journal = {Reports on Mathematical Logic},
	volume = {40},
	year = {2006},
	pages = {15{\textendash}43},
	abstract = {<p>We present an algorithm which allows to define any possible sentence-formative functor of Le\&amp;\#347;niewski{\textquoteright}s Elemen- tary Ontology (LEO), arguments of which belong to the category of names. Other results are: a recursive method of listing possible functors, a method of indicating the number of possible n-place ontological functors, and a sketch of a proof that LEO is function- ally complete with respect to {\&amp;\#8743;,\&amp;\#172;, \&amp;\#8704;, \&amp;\#949;}</p>},
	author = {Urbaniak, Rafal}
}
