TY - JOUR AU - Støvring, Kristian PY - 2006/03/12 Y2 - 2024/03/28 TI - Extending the Extensional Lambda Calculus with Surjective Pairing is Conservative JF - BRICS Report Series JA - BRICS VL - 13 IS - 5 SE - Articles DO - 10.7146/brics.v13i5.21911 UR - https://tidsskrift.dk/brics/article/view/21911 SP - AB - We answer Klop and de Vrijer's question whether adding surjective-pairing axioms to the extensional lambda calculus yields a conservative extension. The answer is positive. As a byproduct we obtain the first ``syntactic'' proof that the extensional lambda calculus with surjective pairing is consistent. ER -