명제와 조건 연습문제 — Sundstrom, Mathematical Reasoning · 2.1절 · 5d번

Sundstrom, Mathematical Reasoning · 2.1절 · 5d번영어 원문

Construct a truth table for each of the following statements:

$\neg Q \to \neg P$

정답·풀이 보기 (영어 원문)

| $P$ | $Q$ | $P \to Q$ | | --- | --- | --- | | T | T | T | | T | F | F | | F | T | T | | F | T | T |

한 번 더 — 비슷한 문제Sundstrom, Mathematical Reasoning · 1.1절영어 원문

Answer each of the following questions.

Is the set of rational numbers closed under addition? Explain.

다 풀었으면 정답 확인

The set of rational numbers is closed under addition since $\dfrac{a}{b} + \dfrac{c}{d} = \dfrac{ad+bc}{bd}$ .

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