Ravichandran, Mohan2021-06-162021-06-162014-10-010002-9939https://hdl.handle.net/11411/3771https://doi.org/10.1090/S0002-9939-2014-12114-9The carpenter problem in the context of II1 factors, formulated by Kadison, asks: Let A? M be a masa in a type II1 factor and let E be the normal conditional expectation fromMonto A. Then, is it true that for every positive contraction A in A, there is a projection P inMsuch that E(P) = A? In this note, we show that this is true if A has finite spectrum. We will then use this result to prove an exact Schur-Horn theorem for positive operators with finite spectrum in type II1 factors and an approximate Schur-Horn theorem for general positive operators in type II1 factors. © 2014 American Mathematical Society.eninfo:eu-repo/semantics/openAccessLinear PreserverMajorizationDoubly Stochastic MatrixArticle2-s2.0-8491960485710.1090/S0002-9939-2014-12114-9Q1