Teaching connection skills requires at least mention of Esperanto.
(The distinction that Max Heirich makes between a fad and a cultural breakthrough is reminiscent of the distinction that Hans Kelsen, in his book ‘Pure Theory of Law’, makes between a highway robber and taxation.)
[Ground of Being]
The swing-rate of their legs is about the same. The difference consists of the force they exert against the ground.
Northrop Frye (1912 – 1991) made many trenchant observations on literature. So if you know someone compiling such a list, you might want to ask them “Would you like Frye’s with that?”
In spite of the distinction between the two types of variables, it is a common practice to conflate them, for the sake of convenience. For example, in Wikipedia’s article on arithmetic progressions, the variable ‘n’ is used both as a bound variable, for defining the sequence, and as a free variable, for specifying the number of terms to be summed.