Re: How can I tell if F is a string or if it is a number?

Pioneer1 wrote:

[...] I see
Newtonian mechanics as a consistent system of units made of physical
quantities. It is a computational device, or an algorithm, that takes
given values of physical quantities as its arguments and transforms
them according to some rule.

This is a big mistake. An algorithm is directed: it transforms input
into output. Newton's laws are undirected: they relate quantities
without saying that one of them results from the other. Certain
specification methods for computer systems work with the same kind
of undirected correspondence, but the approach isn't very common.

--
Reinier Post
.