Tessellate S.T.E.M.S - Mathematics - College - Set 2 - Problem 1

Algebra Level 3

Consider X = [ 0 , 1 ) X=[0,1) .

For a , b X a, b \in X , we define an operation \oplus by a b = { a + b } a\oplus b= \{a+b\} .

For a R , b X a \in \mathbb{R}, b \in X , we define an operation \otimes by a b = { a b } a\otimes b= \{ab\} .

Statement 1. \textbf{Statement 1.} X X is a Q \mathbb{Q} -vector space with addition \oplus and Q \mathbb{Q} -multiplication \otimes

Statement 2. \textbf{Statement 2.} X X is a R \mathbb{R} -vector space with addition \oplus and R \mathbb{R} -multiplication \otimes

Which of the above statements are correct?

Note \textbf{Note} : { m } \{m\} denotes the fractional part of m m .


This problem is a part of Tessellate S.T.E.M.S.

None Only statement 2 Only statement 1 Both statements 1 and 2

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1 solution

Abhishek Sinha
Aug 20, 2018

Take a = b = c = 1 / 2 a=b=c=1/2 . Then { b + c } = 0 \{b+c\}=0 . Hence, 0 = a ( b c ) ( a b ) ( a c ) = 1 / 2 0=a\otimes (b \oplus c) \neq (a\otimes b) \oplus (a\otimes c)=1/2 . Hence, ( X , , ) (X, \oplus, \otimes) is not a vector space either in Q \mathbb{Q} or in R \mathbb{R} .

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