Top 5 mathematical colabs of all time

• The Banarch-Tarski paradox
• The Cantor–Schröder–Bernstein theorem
• The Davis-Putnam-Logemann-Loveland algorithm
• The Lenstra–Lenstra–Lovász algorithm
• The Matiyasevich-Robinson-Davis-Putnam theorem

Honorable mention

The QM-AM-GM-HM inequality chain.