1.R on N defined by:mRn iff m>10n 2. R on Z defined by:mRn iff m+n is even 3. R
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Question
1.R on N defined by:mRn iff m>10n2. R on Z defined by:mRn iff m+n is even
3. R on Z defined by:mRn iff m-n is even
4. E on r defined by:xEy iff y=e^x
5. R on R defined by:xRy iff xy=0
6. S on the set,T, of all triangles in a plane defined by t_1St_2 iff t_1 and t_2 are similar
7. perpendicularity on the set,L, of all straight lines in the plane
8. R with the domain R and the codomain the set,P, of all real polynomials in one unknown, defined by aRp iff a is a root of p
9. R on the set PXL, where P is the set of all points in the plane,L is the set of all straight lines in the plane, and pRl means that the point p lies on the line l
10. P on the set,A, of all people, where xPy means x is a parent of y
11. S on the set of all Americans where aSb means a is a sibling of b
12. B on the set of all Americans where aBb means a is a brother of b
13. R on the set R defined by xRy iff(x<0) or(x=0 and x=y)
Give six further examples of relations where the domain and codomain are the same, three where the underlying set is mathematical, three where the underlying set is a set of people
Explanation / Answer
MATHEMATICAL EXAMPLES:
a) K on R to [-1,1] such that, xKy means y = sin x
b) S on R to R , such that aSb means y=x+2
c) T on R to R+(0,) , such that xTy means y=ex
ON SET OF PEOPLE:
a) T defined by aTb means a in a cousin of b
b) K defined by xKy means x's DNA mathes with y's DNA.
c) M defined by aMb means a has same height as person b.
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