What do we call a rule?
Consider this example:
33). B moves about according to
rules which A gives him.
B is supplied with the following table:
A gives an order made up of the letters in the table, say:
“a a c a d d d”.
B looks up the arrow corresponding to each letter of the order
and moves accordingly; in our example thus:
The table 33) we should call a rule (or else “the
expression of a rule”.
Why I give these synonymous expressions will appear later.)
We shan't be inclined to call the sentence
“a a c a d d d” itself a rule.
It is of course the description of the way B has to take.
On the other hand, such a description would under certain circumstances
be called a rule, e.g., in the following
case:
30.
34). B is to draw various
ornamental linear designs.
Each design is a repetition of one element which A gives
him.
Thus if A gives the order “c a d a”, B
draws a line thus: