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Definition 1.1
High School Mathematics · অধ্যায় 1 — Numbers and Sets of Numbers
- N is the set of natural numbers: 0,1,2,3,…
- Z is the set of integers: …,−2,−1,0,1,2,…
- Q is the set of rational numbers: all quotients qp with p∈Z, q∈N and q=0.
- R is the set of real numbers: all the numbers that can be placed on the number line.
উদাহরণ
Example 1.3
Let us place a few numbers in the smallest family that contains them.
- 428=7, so 428∈N even though it is written as a fraction: always simplify first.
- −3.5=−1035=−27 is rational but not an integer.
- 0.333… (the digit 3 repeating forever) equals 31, a rational number.
- 2 and π are real but not rational, as we are about to see for 2; such numbers are called irrational.
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