(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]