首先是离散数学系列,主要看的书是《how to prove it》 by Daniel J. Velleman P∧Q,P∨Q,¬P 这三个逻辑运算符号是本章最重要也是最基础的,是所有逻辑式的基本构成逻辑单元. Truth table (真值表) : 简单来说, 给定所有输入条件的真假,通过真值表可以罗列出一个逻辑式的所有结果. De Morgan's laws ...
When the 19th century dawned, no real evidence had accumulated to prove the wave theory of light. That changed in 1801 when Thomas Young, an English physician and physicist, designed and ran one of the most famous experiments in the history of science. It's known today as the double-slit...
The word atom literally means not-further-splittable, which is a quality atoms eventually appeared not to have. Or rather more precise: the structure we now call the atom was named after a hypothetical smallest possible unit of matter, which in itself is a non-sequitur, since at atomic and...
Find the discrete time convolution __f(n) * g(n) for, f(n) = u(n) - u(n-4) and g(n) = f(n)__ How to find harmonic conjugate? How do you do differentials? Find the convolution f(t)*g(t) given f(t)=1, g(t)=cos 2t. How to prove a function is periodic? How to...
You might think of gender identity as a way of describing how gender becomes internal—something that becomes an integral part of who we are, a part that many of us would be reluctant to completely abandon. The concept of gender identity is therefore consistent with an indi- vidual approach ...
Our intent is to clarify a series of prominent shifts—encompassing food and forestry, large-scale electrification, industrial adaptation, clean-power generation, and carbon management and markets—that would need to happen for the world to move rapidly onto a 1.5-degree pathway. ...
What we see here for the envelope function is the so-calledbeating. It’s obvious that everything depends on the mesh size. To understand what’s going on, we need a pencil, paper, and patience. We knew the answer was , but we had “intentionally” given an incorrect estimate in the...
202.Forensic GIS– Applying science and geographic information for the investigating of a crime – such as using GPS-recorded information in vehicles to prove the location at the scene of a crime. (Forensic GIS – The Role of Geospatial Technologies for Investigating Crime and Providing Evidence)...
For Anonymous it wasn’t enough to shut down one’s own site, and make one’s own decision to go dark- Anonymous wanted to prove once and for all to big media companies such as CBS and Universal Music that it is but for the grace of Anonymous that their sites exist at all. In a...
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