assertion可数吗(如何证明constructible numbers的集合是可数的)

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如何证明constructible numbers的集合是可数的
1)代数数是满足整系数代数方程的数.而所有整系数代数方程的集合是可数的,每个代数方程的解集是可数的,所有解集的并即是所有代数数的集合,所以代数数集合是可数个可数集的并,所以可数.
2) 定义两个多项式的结式(Res)如图
设a,b为代数数,并且分别是多项式P(x),Q(x)的根
则a+b是Res(P(x),Q(z-x))的根
ab是Res(P(x),x^nQ(t/x))的根
所以它们都是代数数,代数数对+,×封闭
determinant可数吗evidence呢tax可数吗(看到pay tax to和pay taxes to两种用法)
(1) determinant=可数; (a) The social determinants of health are the conditions in which people are born, grow, live, work and age, including the health system.
(b) The beginnings of matrices and determinants goes back to the second century BC although traces can be seen back to the fourth century BC.
(c) A determinant is a special kind of matrix, one that has a numerical value. The value of a matrix may be 3, for example. We write a determinant with vertical lines.
(d) The recursive definition also works for 2 × 2 determinants, if we define the...
(2) evidence=不可数; 单数/复数相同.
(a) Evidence in its broadest sense includes everything that is used to determine or demonstrate the truth of an assertion.
(b) A thing or things helpful in forming a conclusion or judgment: The broken window was evidence that a burglary had taken place. Scientists weigh the evidence...
(c) 极少用"evidences" : "Intro to Ashby Camp’s rebuttal of Douglas Theobald’s ’’29 Evidences for Macroevolution’’...
(3) tax=可数; tax, taxes (多类型的税)
(a) a tax on our resources
(b) a cut in tax on new cars
(c) "In this world nothing can be said to be certain, except death and taxes"
(d) The continual noise was a tax on her nerves.
(e) "Read my lips: no new taxes"

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