What does Q* mean

  • Thread starter r0bHadz
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  • #1
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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 dont think it is -l.-
 

Answers and Replies

  • #2
SammyS
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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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