Finite sets, mappings, cardinals, and arithmetic in intuitionistic NF. Beeson, M. 2021.  
Pdf  bibtex   @article{beeson2021,
	author = {Michael Beeson},
	date-added = {2021-03-23 13:15:55 -0700},
	date-modified = {2021-03-23 14:55:22 -0700},
	title = {Finite sets, mappings, cardinals, and  arithmetic in intuitionistic {NF}},
	url_pdf = {inf-basicsZML.pdf},
	year = {2021}} 
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