Linguistics is probably one of the few disciplines with its own specific mathematisation. This it owes mainly to the very nature of language and to properties like transposability, substitutability, autonymy, and compositionality. From the very early days of logic, there appeared a special formalisation, in the shape of an ideography. Among the various possible types of mathematisation, quantitative methods have not so far proved very productive. For a long time, semantic methods were the most fruitful ; notably, they were instrumental in the creation of new mathematical objects (e. g. the extension of a concept, which led to the notion of classes). In the end, the mathematisation of linguistics � has been successful (and has forged intrin...