impendia，我目前正在上一门离散数学课，用的是 Alan Doerr 和 Kenneth Levasseur 写的《Applied Discrete Structures》(http://faculty.uml.edu/klevasseur/ads2/)。这是免费公开的，不过我建议别看他们网站上的 PDF，因为里面有挺多错误，是……
impendia, I'm currently taking a discrete mathematics class that Applied Discrete Structures by Alan Doerr and Kenneth Levasseur (http://faculty.uml.edu/klevasseur/ads2/). It's freely available, though I recommend steering away from the PDF on their site as it's got quite a few errors that are…
我之前被这些数学书吓到了，但我从 Al Doerr 和 Ken Levasseur 写的《Applied Discrete Structures》[1] 里找到了很多有意思的内容。我是被“逻辑”那一章吸引的，而且完全没让我失望。你可以从他们的网站上免费下载。> 这书有点老了，而且可惜不免费。其实是……
I was intimidated by these math books, but I was able to find a lot of interesting stuff in "Applied Discrete Structures" by Al Doerr and Ken Levasseur[1]. I was attracted by the "Logic" section, and I was not disappointed. You can download it for free from their website. > It’s a bit old and unfortunately not free It's…
impendia，我目前正在上一门离散数学课，用的是 Alan Doerr 和 Kenneth Levasseur 写的《Applied Discrete Structures》(http://faculty.uml.edu/klevasseur/ads2/)。这是免费公开的，不过我建议别看他们网站上的 PDF，因为里面有挺多错误，是……
impendia, I'm currently taking a discrete mathematics class that Applied Discrete Structures by Alan Doerr and Kenneth Levasseur (http://faculty.uml.edu/klevasseur/ads2/). It's freely available, though I recommend steering away from the PDF on their site as it's got quite a few errors that are…
我之前被这些数学书吓到了，但我从 Al Doerr 和 Ken Levasseur 写的《Applied Discrete Structures》[1] 里找到了很多有意思的内容。我是被“逻辑”那一章吸引的，而且完全没让我失望。你可以从他们的网站上免费下载。> 这书有点老了，而且可惜不免费。其实是……
I was intimidated by these math books, but I was able to find a lot of interesting stuff in "Applied Discrete Structures" by Al Doerr and Ken Levasseur[1]. I was attracted by the "Logic" section, and I was not disappointed. You can download it for free from their website. > It’s a bit old and unfortunately not free It's…