Since E∩λ is also stationary in λ, Proposition 1.7 implies that Mλ is not free, a contradiction. □ See also Exercises 13 and VI. 11 for other proofs of 3.2, especially when R is a p.i.d.. (The proof in Exercise 13 uses a property of cardinals which is weaker than being ...
know about the forms of the cardinal and ordinal numbers.Teaching difficult Points1. learn how to use the cardinal numbers and ordinal numbers in daily life.2. can use cardinal numbers to do some writing.Teaching aidsMulti-media,PPT,BlackboardTeaching processStep1 Lead-inShow students my ...