Moti Gitik

Mordechai "Moti" Gitik (Hebrew: מרדכי ״מוטי״ גיטיק‎) is a mathematician, working in set theory, who is professor at the Tel-Aviv University. He was an invited speaker at the 2002 International Congresses of Mathematicians, and became a fellow of the American Mathematical Society in 2012.

Gitik proved the consistency of "all uncountable cardinals are singular" (a strong negation of the axiom of choice) from the consistency of "there is a proper class of strongly compact cardinals". He further proved the equiconsistency of the following statements:

• There is a cardinal κ with Mitchell order κ.
• There is a measurable cardinal κ with 2 > κ.
• There is a strong limit singular cardinal λ with 2 > λ.
• The GCH holds below ℵ_ω, and 2=ℵ_ω+2.

• Moti Gitik, "The power set function", Proceedings of the ICM, Beijing 2002, vol. 1, 507–513. Also arXiv.