One story says it was first used during the early days of the telephone to tell an operator that a message had been received.
VOA: special.2010.02.28
The syntax is OK in the sense of, it is an operand, an operator, an operand, so syntactically it's OK.
这里的语法应该是好的,有个运算对象,一个运算符,另外一个运算对象,因此语法上是没错的。
And h with the carrot or the hat here, well, that carrot or hat tell us it must be an operator, and this is called the Hamiltonian operator.
而且带帽的H,好,这个帽告诉我们它肯定是一个算符,这个被称为哈密顿算符。
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