The wave function is not a description of a single system but of an ensemble of systems.
波函数不是描述单个系统,而是描述系统的集合。
The purpose of abstraction is not to be vague, but to create a new semantic level in which one can be absolutely precise.
比喻要有长期坚持和忍耐的毅力。
投资者可以做出的最重要的决定是资产配置决定。
Quality is not just the absence of defects; it is the presence of value.