Chapter 2: Problem 13
Consider the following statement: \(\forall\) basketball players \(x, x\) is tall.
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Chapter 2: Problem 13
Consider the following statement: \(\forall\) basketball players \(x, x\) is tall.
These are the key concepts you need to understand to accurately answer the question.
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Some of the arguments in 7-18 are valid by universal modus ponens or universal modus tollens; others are invalid and exhibit the converse or the inverse error. State which are valid and which are invalid. Justify your answers. If a number is even, then twice that number is even. The number \(2 n\) is even, for a particular number \(n\). \(\therefore\) The particular number \(n\) is even.
Let the following law of algebra be the first statement of an argument: For all real numbers \(a\) and \(b\), $$ (a+b)^{2}=a^{2}+2 a b+b^{2} . $$ Suppose each of the following statements is, in turn, the second statement of the argument. Use universal instantiation or universal modus ponens to write the conclusion that follows in each case. a. \(a=x\) and \(b=y\) are particular real numbers. b. \(a=f_{i}\) and \(b=f_{j}\) are particular real numbers. c. \(a=3 u\) and \(b=5 v\) are particular real numbers. d. \(a=g(r)\) and \(b=g(s)\) are particular real numbers. e. \(a=\log \left(t_{1}\right)\) and \(b=\log \left(t_{2}\right)\) are particular real numbers.
Consider the following statement: \(\forall\) integers \(n\), if \(n^{2}\) is even then \(n\) is even. Which of the following are equivalent ways of expressing this statement? a. All integers have even squares and are even. b. Given any integer whose square is even, that integer is itself even. c. For all integers, there are some whose square is even. d. Any integer with an even square is even. e. If the square of an integer is even, then that integer is even. f. All even integers have even squares.
In 21 and 22 , rewrite each statement without using variables or the symbol \(\forall\) or \(\exists\). Indicate whether the statement is true or false. a. \(\forall\) real numbers \(x, \exists\) a real number \(y\) such that \(x+y=0\). b. \(\exists\) a real number \(y\) such that \(\forall\) real numbers \(x, x+y=0\).
The notation \(\exists !\) stands for the words "there exists a unique." Thus, for instance, " \(\exists ! x\) such that \(x\) is prime and \(x\) is even" means that there is one and only one even prime number. Which of the following statements are true and which are false? Explain. a. \(\exists !\) real number \(x\) such that \(\forall\) real numbers \(y, x y=y\). b. \(\exists !\) integer \(x\) such that \(1 / x\) is an integer. c. \(\forall\) real numbers \(x, \exists !\) real number \(y\) such that \(x+y=0\).
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