CONTINUITY OF UNIVERSALLY MEASURABLE HOMOMORPHISMS
CONTINUITY OF UNIVERSALLY MEASURABLE HOMOMORPHISMS
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普遍可测同态的连续性
DOI:
10.1017/fmp.2019.5
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发表时间:
2019
期刊:
影响因子:
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通讯作者:
ROSENDAL, CHRISTIAN
中科院分区:
文献类型:
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作者:
ROSENDAL, CHRISTIAN
Answering a longstanding problem originating in Christensen’s seminal work on Haar null sets [Math. Scand. 28 (1971), 124–128; Israel J. Math. 13 (1972), 255–260; Topology and Borel Structure. Descriptive Topology and Set Theory with Applications to Functional Analysis and Measure Theory, North-Holland Mathematics Studies, 10 (Notas de Matematica, No. 51). (North-Holland Publishing Co., Amsterdam–London; American Elsevier Publishing Co., Inc., New York, 1974), iii+133 pp], we show that a universally measurable homomorphism between Polish groups is automatically continuous. Using our general analysis of continuity of group homomorphisms, this result is used to calibrate the strength of the existence of a discontinuous homomorphism between Polish groups. In particular, it is shown that, modulo has finite chromatic number.
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DOI:
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