题目：On variational principle for entropy-like invariants
报告人：Wen-Chiao Cheng（Chinese Culture University）
摘要：During this talk, pre-image entropy and entropy-like invariants are disscussed. Some questions are presented and then talk about conditional entropy's propositions. Variational principle, subadditivity and commutativity properties for entropy and pressure are also discussed. Finally, some new results are also shown to see what we can do next step for semigroup action on entropy.