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Date: 29-11-2020
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Date: 10-1-2020
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Date: 27-11-2019
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Every irrational number has an approximation constant
defined by
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where is the nearest integer to
and
is the infimum limit. The quantity
measures how well
is approximated by the rational number
.
is said to be badly approximable if
. An irrational number is badly approximable iff the terms
of its continued fraction
are bounded. Since quadratic surds have periodic continued fractions, they are badly approximable. The maximum possible value of
is
, attained for example at
, where
is the golden ratio.
REFERENCES:
Burger, E. B. Exploring the Number Jungle: A Journey Into Diophantine Analysis. Providence, RI: Amer. Math. Soc., 2000.
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