Note 39 — Chapter VI · THE FUNDAMENTAL FACTS OF SYNTAX.

This symbol is somewhat different from the one employed by Professor Paul, which is (a + (b) + c). Though we think the one we have chosen is rather more simple, the other is not difficult to understand, as symbolising the result of combining (a + b) with (b + c). If, instead of two similar sets of brackets, different ones were used, say {a + [b} + c], the meaning of what now appears as (b) might be clearer still. Professor Paul uses a, b, and c as indicating three different parts; we use three letters for three parts, but make two letters alike, because two of the three parts have the same function. Cf., later on, for our symbol of the second case, page 119.