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Unformatted text preview: r a moment, consider
{3, 1, 4, 1, 5, 9, 2, 6, 5, 3, 5, 8, 9, 7, . . . } 54 CHAPTER 2. ITERATED FUNCTION SYSTEMS and
{4, 6, 6, 9, 2, 0, 1, 6, 0, 9, 1, 0, 2, 9, . . . }
Are these random sequences? Of course, the ellipsis makes this question impossible to answer. Many would say the ﬁrst is not, because we recognize it as the
ﬁrst 14 digits in the decimal expansion of π , and assume the remaining digits
of the sequence are the remaining digits of π . If this is true, then of course the
sequence is not random in our sense, because we have just given a speciﬁcation
more compact than listing the entire (inﬁnite) sequence.
(An undergraduate classmate of mine decided to memorize the ﬁrst 200 digits
of the decimal expansion of π , to impress people at parties, he said, though which
people would be impressed by this never was so clear to me. He used an old
book from the library, eventually seen to have a mistake in the 20th digit. So
he had memorized 200 digits of some real number – in fact, of inﬁnitely many
real numbers – but not π . But until he learned of the mistake in the book, he
thought his 200...
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This document was uploaded on 02/14/2014 for the course MATH 290B at Yale.
 Fall '14
 AmandaFolsom
 Geometry, Fractal Geometry, Limits, The Land

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