向外 发表于 2025-3-26 22:48:01
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Parity,r of times the door was opened must be an even number. Arguments that use ideas of this kind are called . We begin our tour into the applications of parity based arguments by first studying the following examples.伤心 发表于 2025-3-27 21:17:13
http://reply.papertrans.cn/24/2301/230020/230020_36.pngfaculty 发表于 2025-3-27 23:46:42
https://doi.org/10.1007/978-1-4842-7101-8also have been written in the form (., . ⋯ . ⋯ .). In fact, if we define the equivalence relation on [.] by . ~ . if there is a sequence . = ., .,…,. = . with .(.) = . then the equivalence classes are just the cycles. Notice however, that cycles are not just sets. They are cyclically ordered in a pa返老还童 发表于 2025-3-28 04:24:11
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