稳定正则性引理再探
The stable regularity lemma revisited
摘要:
本文证明了关于任意Keisler测度μ在V上,nu在W上的一个正则引理,其中二部图(V,W,R)可定义在饱和结构M中,且公式R(x,y)是稳定的.证明是相当快的,并使用局部稳定性理论。其中(V,W,R)是伪有限的,mu,nu是计数测度,并且M被适当地选择(例如集合论的非标准模型)的特殊情况产生了Malliquid-Shelah的稳定正则性定理(AMS Transactions,366,2014,1551-1585),尽管没有明确的界限或公平性。
英文摘要:
We prove a regularity lemma with respect to arbitrary Keisler measures mu on V, nu on W where the bipartite graph (V,W,R) is definable in a saturated structure M and the formula R(x,y) is stable. The proof is rather quick and uses local stability theory. The special case where (V,W,R) is pseudofinite, mu, nu are the counting measures and M is suitably chosen (for example a nonstandard model of set theory), yields the stable regularity theorem of Malliaris-Shelah (Transactions AMS, 366, 2014, 1551-1585), though without explicit bounds or equitability.
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