Let U be a non-principal ultrafilter over w. Suppose (r, :n 0, {n

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Chapter6: Linear Transformations
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Problem 20CR: Let T be a linear transformation from R3 into R such that T(1,1,1)=1, T(1,1,0)=2 and T(1,0,0)=3....
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Let U be a non-principal ultrafilter over w. Suppose (r, :n<w) is a sequence of real
numbers. We say that r is the U-limit of (n : n <w) and write U lim e, = r iff for
every e> 0, {n <w: l, - | <e} €U.
Show the following.
(a) If lim a, r, then limr,
(b) If lim.r,
a and 4 lim a
6, then a
Transcribed Image Text:Let U be a non-principal ultrafilter over w. Suppose (r, :n<w) is a sequence of real numbers. We say that r is the U-limit of (n : n <w) and write U lim e, = r iff for every e> 0, {n <w: l, - | <e} €U. Show the following. (a) If lim a, r, then limr, (b) If lim.r, a and 4 lim a 6, then a
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