William Lawvere
Francis William Lawvere ( ; born February 9 , 1937 ) is a mathematician known for his work in category theory , topos theory and the philosophy of mathematics . 
<triplet> William Lawvere <subj> February 9, 1937 <obj> date of birth <subj> mathematician <obj> occupation <triplet> topos theory <subj> category theory <obj> studied by