 [Warning: Here the terminology in the literature varies a lot: “strongly represent” is sometimes called, e.g., “represent”, “numeralwise express”, “bi-numerate”, “define” or “strongly define”; “weakly represent” is in turn also expressed, e.g., by “represent”, “define”, “weakly define”, or “numerate”. One should be careful here and focus on the relevant definitions, and not let the words mislead.]