1. The Atiyah-Singer Index Formula for Subelliptic Operators on Contact Manifolds Open Access Author: Van Erp, Johannes Title: The Atiyah-Singer Index Formula for Subelliptic Operators on Contact Manifolds Graduate Program: Mathematics Keywords: Index theoryHypoelliptic operatorsContact manifolds File: Download hypindex.pdf Committee Members: Nigel David Higson, Committee Chair/Co-ChairJohn Roe, Committee MemberVictor Nistor, Committee MemberAnna L Mazzucato, Committee MemberMurat Gunaydin, Committee Member