As stated in OP, problem solving requires more complete skills

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Complicated skills contain many small steps of proofs. -trivial- 给 trivial 发送悄悄话 (316 bytes) () 01/15/2015 postreply 13:25:16

My answers: -SwiperTheFox- 给 SwiperTheFox 发送悄悄话 SwiperTheFox 的博客首页 (1173 bytes) () 01/15/2015 postreply 13:32:53

It seems that we have totally different understanding of what is -trivial- 给 trivial 发送悄悄话 (100 bytes) () 01/15/2015 postreply 13:40:18

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