有一年我教diff eqn, 就用书上教过的内容和办法,把当年的Putnam 一气解了5道,学生们都惊呆了。(纯属凑巧,我也很惊讶。)
有一年我教diff eqn, 就用书上教过的内容和办法,把当年的Putnam 一气解了5道,学生们都惊呆了。(纯属凑巧,我也很惊讶。)
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