周健工：马拉比是一个写作的高手，他写这本书的立意我觉得也是非常高的。从头到尾读完之后，我有一个突出的感受：马拉比驱动这本书的叙事最底层的那个力量是什么？AGI是威力无比强大的一个技术，也可能是人类的一个终极技术，就像他的这本书的原名《The Infinity Machine》，它是一个上帝的机器。对人类未来的福祉，甚至对人类的文明影响这么大，它作恶的可能性也是有的。
Have you ever heard of Windhawk? It’s a cult-favorite Windows tweaking tool I’ve been dabbling with for years, and I’ve had readers ask me about it. If you dig through Windows enthusiast communities — on Reddit, in forums, and elsewhere — you’ll find lots of people chatting about Windhawk and sharing how they use it to customize their PCs.，更多细节参见heLLoword翻译官方下载
练好基本功。构建立体展示机制，优化“综合博物馆+专题纪念馆+旧址”展陈格局，实施延安革命纪念馆一级博物馆改陈等工程，革命文物“活起来”。。业内人士推荐safew官方版本下载作为进阶阅读
Often people write these metrics as \(ds^2 = \sum_{i,j} g_{ij}\,dx^i\,dx^j\), where each \(dx^i\) is a covector (1-form), i.e. an element of the dual space \(T_p^*M\). For finite dimensional vectorspaces there is a canonical isomorphism between them and their dual: given the coordinate basis \(\bigl\{\frac{\partial}{\partial x^1},\dots,\frac{\partial}{\partial x^n}\bigr\}\) of \(T_pM\), there is a unique dual basis \(\{dx^1,\dots,dx^n\}\) of \(T_p^*M\) defined by \[dx^i\!\left(\frac{\partial}{\partial x^j}\right) = \delta^i{}_j.\] This extends to isomorphisms \(T_pM \to T_p^*M\). Under this identification, the bilinear form \(g_p\) on \(T_pM \times T_pM\) is represented by the symmetric tensor \(\sum_{i,j} g_{ij}\,dx^i \otimes dx^j\) acting on pairs of tangent vectors via \[\left(\sum_{i,j} g_{ij}\,dx^i\otimes dx^j\right)\!\!\left(\frac{\partial}{\partial x^k},\frac{\partial}{\partial x^l}\right) = g_{kl},\] which recovers exactly the inner products \(g_p\!\left(\frac{\partial}{\partial x^k},\frac{\partial}{\partial x^l}\right)\) from before. So both descriptions carry identical information;
FT Edit: Access on iOS and web