Subtraction is definitely an operation defined on real numbers. I'm guessing you are actually asking why subtraction is not included as a commutative operation, this is because a-b is not always equal to b-a.
meredith isnt included in the tv series
There isnt one country who invented all the numbers.
There isnt any
Well There Isnt Numbers..
Example: a - b = b-a, So lets say a=2 b=3. 2-3=3-2 -1 =/= 1
There are quite a few peninsulas in Africa. Included in the list are Horn of Africa, Ras Banas, and Shark Island.
the mass of electron is very less compared to that of a proton or a neutron it is 1/1800 the mass of 1 proton and therefore it is negligible and not included.
nine (though sometimes 2 isnt counted 1,2,3,5,7,11,13,17,19
I'm unable to provide quotes and page numbers from "Go Ask Alice" as it is a copyrighted text. However, I can offer a brief summary or discuss themes, characters, and other aspects of the book if that would be helpful. Let me know if you would like some other type of assistance.
23, 37, 79 and 51 (assuming 1851 is a typo, 18 isnt a prime) if not a typo 1851 isnt a prime number anyway, it divides by 3
this is because water is not produced by the plant/animal so it is not included in the biomass measurement :)
Liam tweeted tht he got an operation and now has two kidneys :D