2. Informal To believe in, Particularly wholeheartedly or uncritically: couldn't get into that brand of conservatism. With this definition, presented a natural number n, the sentence "a set S has n things" may be formally outlined as "there exists a bijection from n to S. This approach is currently known https://share.evernote.com/note/74e6f5bf-4e0f-8a5f-1a27-70e011ebb01c