The class of numeral can pose classification problems, since
numerals can be categorized as members of other categories, i.e. as
- adjectives le sette meraviglie, il primo figlio;
- nouns e' uscito il sette a Napoli;
- pronouns entrambi tacevano.
The semantic criterion can be a
means to recognize them:
- they indicate numerical quantities and can be subdivided into cardinals and ordinals.