# 17-26 true or false questions 17. The smallest positive real number is c, where c = card(0,1). 18. To show

###### Question:

17-26
true or false questions
17. The smallest positive real number is c, where c = card(0,1). 18. To show that two sets A and B are equal, show that x A and x B. 19. If (vx)P(e) is false, then P(x) is never true for that domain. 20. If R is a relation on A and if (a, a) is true for some a in A, then R is reflexive. 21. If f:A → B is a function, then B = the range of f
22. The complex numbers of the form a +bi, where a and b are integers, is uncountable 23. If A is a countable set and if B is any infinite set, then card (A U B) -card(A). 24. If R is a relation from A to B and if S is a relation from B to C such that neither R nor S is a function, then S o R is not a function either. 25. A conjecture is the same as an open question. 26. Inductive proofs were used extensively by the ancient Greek geometers, like Euclid.

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