Q* Meaning in Math: Understand the Concept

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In summary, "Q*" in math refers to the set of positive rational numbers, while "Q" can include both positive and negative rational numbers. A number in "Q*" can be written as a ratio of two integers and is positive. "Q*" can be represented on a number line by marking the positive rational numbers, and it is an important concept in math because it is used in everyday calculations and applications.
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r0bHadz
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Homework Statement


In Grimaldis discrete math book he asks

Determine which of the statements are true which are false:

ℚ*∩ ℤ = ℤ

Homework Equations

The Attempt at a Solution


he never explained in his book what * represents.

I tried google "what does Q* mean in mathematics" and "Q* in mathematics" with no luck. Does anyone know what he means with *? My first thought was its both Q+ and Q- but I don't think it is -l.-
 
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I believe that ℚ* is the set of non-zero rational numbers. (According to the Appendix)

Do you have a copy of Grimaldi's textbook?
 
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FAQ: Q* Meaning in Math: Understand the Concept

What does "Q*" mean in math?

The symbol "Q*" in math typically refers to the set of rational numbers. These are numbers that can be expressed as a ratio of two integers, such as 1/2 or 3/4.

How is "Q*" different from "Q" in math?

The symbol "Q" in math refers to the set of rational numbers as well. However, "Q*" is often used to specifically denote positive rational numbers, while "Q" can include both positive and negative rational numbers.

What does it mean when a number is in "Q*"

When a number is in "Q*", it means that it can be written as a ratio of two integers, and that the ratio is positive. For example, 3/4 is in "Q*" because it can be written as a ratio of 3 and 4, and the ratio is positive. However, -3/4 would not be in "Q*" because the ratio is negative.

How can "Q*" be represented on a number line?

"Q*" can be represented on a number line by marking the positive rational numbers, starting from 0 and moving to the right. This would include all numbers that can be expressed as a ratio of two positive integers, such as 1/2, 3/4, and 5/6.

Why is "Q*" an important concept in math?

"Q*" is an important concept in math because it represents a fundamental set of numbers that are used in everyday calculations and applications. Rational numbers are used in measurements, finance, and many other real-life situations, making "Q*" an essential concept to understand in math.

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