John G.Proakis 的数字通信，通信领域经典教材，英文原版，适合有一定通信基础的读者阅读。

Lee W.Johnson R.Dean Riess Jimmy T.Arnold Introduction to linear Algebra

Learning Python 5th Edition （Python学习手册第五版）可复制粘贴，有目录 This fifth edition completed in 2013 is a revision of the prior, updated to cover both Python 3.3 and 2.7, the current latest releases in the 3.X and 2.X lines. It ncorporates all language changes introduced in each line since the prior edition was published, and has been polished throughout to update and sharpen its presentation. Specifically: • Python 2.X coverage here has been updated to include features such as dictionary and set comprehensions that were formerly for 3.X only, but have been back-ported for use in 2.7. • Python 3.X coverage has been augmented for new yield and raise syntax; the __pycache__ bytecode model; 3.3 namespace packages; PyDoc’s all-browser mode; Unicode literal and storage changes; and the new Windows launcher shipped with 3.3. • Assorted new or expanded coverage for JSON, timeit, PyPy, os.popen, generators, recursion, weak references, __mro__, __iter__, super, __slots__, metaclasses, descriptors,random, Sphinx, and more has been added, along with a general increase in 2.X compatibility in both examples and narrative.

密码编码学与网络安全——原理与实践（第五版），英文版答案，共23章120页，含思考题和习题，