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(Solved): (1.1) Using the field axioms of R (given in SG^(1), pg. 5), provide the solutions to Example 02.1 (a ...



(1.1) Using the field axioms of

R

(given in

SG^(1)

, pg. 5), provide the solutions to Example 02.1 (a), (b) and (c), SG pg. 6. In each of your proofs you must indicate which field axiom(s) you are using, e.g. (Axiom A2), (Axiom M5), etc. (1.2) Prove that for each

ninN,n>0

. State and use the field axioms of

R

in your proof as done in (1.1). (1.3) Prove that for every

xinREEninN

such that

n>x

. (1.4) Let

(O)/()!=AsubeR

and suppose that

\beta

is a lower bound for

A

. Prove that

\beta =infAiffAAR∋\epsi lon>0EEainA

such that

a<\beta +\epsi lon

. (1.5) Let

D={(2^(n)-1)/(2^(n))inR:ninN}

Determine whether

D

is bounded in

R

. If so, find

supD

and

infD

. You must prove all your answers. [10] (1.6) Let

(O)/()!=SsubeR

such that

S

is bounded below. For

kinR

let

kS={ks:sinS}

If

k<0

, prove that

kS

is bounded above and

supkS=kinfS

. [6] (1.7) Give the solution to Activity 02.1(c), SG, pg. 9. [5]



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