“retract”的概念、定义、翻译、参考文献-科学参考

单词	retract
释义	retract [`rē´trakt] ^MATHEMATICS A subset R of a topological space X is a retract of X if there is a continuous map f from X to R, with f (r ) = r for all points r of R.
随便看	squirt gun squishing squitter Sr sr SRAM SRA-size SRC SR cylinder oil SRMS SRS SS SS 433 SSB SS Cygni stars SSD SSI ss loran SSM SSP SSR SST S star s-state SSTV

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