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G. Lipschitz Continuity I
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the Real Analysis appendices of

Why Slopes
and
More Math

Volume 3

Printed in Canada
ISBN 0-9697564-3-7

These  Real Analysis appendices continue the decimal viewpoint of limits, continuity and convergence in chapter 14. and this further lesson

A. What's Next
B. Pigeon Hole Principle
B. Bolzano-Weierstrass
C1. Triangle Inequality
C2. Triangle Inequality
C. More T.Inequality
D. Sets & Sequences
D. Monotone Sequences
E. Limits,  Properties
E Limits & Error Control
F. Continuous Functions
F. Closed Range Thm
F. Intermediate Val. Thm
F. Compactness Thm
F. Equicontinuity Thm
F Extreme Value Thm
G. Rolle's Theorem etc
G. Mean Val. Thm.
G. Constant Difference Thm
G. Lipschitz Continuity I
PS: One Sided Range Theorems
G. Velocity Revisited
G. Sufficient Conditions
H. Riemann Sums Conv
H. Lipschitz Continuity II

Proofs of  one-sided theorems could be of interest in the study of 2D topology.


If  you like these appendices to Volume 3,  you may also like (a)  the foreword of Volume 3 and chapter 14 with its decimal view of limits, (b) Volume 2,  Three Skills for Algebra (for its 4 skills, not 3, for algebra), (c)  this treatment of  Exponents & Radicals Exactly,  (d) this geometric treatment of  complex numbers,  (e) the  Euclidean Geometry with a geometric proof of the distributive law for complex numbers,   (f) Pattern Based Reason  - its  logic elements and  online postscripts on logic. 

Vol 1A Logic Postscripts
online only include

Proof by Absurdity alias proof by contradiction

How the demand for consistency supports the law of the excluded middle

Reality versus or with the aid of Imagination

Would you like to show   others how to be  algebra power users? Professor WhySlopes shouts his methods for algebra skill development  are likely to work.  Try them. They are different.

Lipschitz Continuity

Then f(x) is said to be Lipschitz Continuous on this interval [a,b] if and only if there is a constant K ³ 0 such that
|f(x2)-f(x1)| £ K·|x2-x1|
whenever x1 and x2 are both in the interval [a,b]. Note when
|f(x2)-f(x1)| £ K·|x2-x1|
whenever x1 and x2 are both in the interval [a,b] then the number K is called a Lipschitz continuity constant for the function f(x) on the interval [a,b].

Continuity and Equicontinuity

Let e > 0 be given. Suppose K > 0 is a Lipschitz continuity constant for the function f(x) on the interval [a,b]. Then |x1-x2| < d = e[1/(K)] implies |f(x1)-f(x2)| £ K·|x1-x2| < e. Thus Lipschitz continuity on an interval implies continuity at each point x1 on the interval. It furthers implies equicontinuity on that interval. Recall that a  function f(x) is said to be equicontinuous on an interval [a,b] if and only if for each e > 0, there exist at least one d > 0 such that
|f(x2)-f(x1)| < e
whenever x1 and x2 are both in the interval [a,b] and |x1-x2| < d.

 

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