titles in this series · 2019. 2. 12. · titles in this series volume 5 andrew bruckner...
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Titles in This Series Volume 5 Andre w Bruckner
Differentiation o f real functions 1994
4 Davi d Ruelle Dynamical zeta functions for piecewise monotone maps of the interval 1994
3 V . Kumar Murty Introduction to Abelian varieties 1993
2 M . Ya. Antimirov, A. A. Kolyshkin, and Remi Vaillancourt Applied integral transforms 1993
1 D . V. Voiculescu, K. J. Dykema, and A. Nica Free random variables 1992
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Volume 5
CRM MONOGRAPH SERIES Centre d e Recherches Mathematique s Universite d e Montrea l
Differentiation o f Real Function s
Andrew Bruckne r
The Centr e d e Recherche s Mathematique s (CRM ) o f th e Universite d e Montrea l wa s create d i n 196 8 t o promot e research i n pur e an d applie d mathematic s an d relate d disciplines. Amon g it s activitie s ar e specia l them e years , summer schools , workshops , postdoctora l programs , an d publishing. Th e CR M i s supporte d b y th e Universit e d e Montreal, th e Provinc e o f Quebe c (FCAR) , an d th e Natural Science s an d Engineerin g Researc h Counci l o f Canada. I t i s affiliate d wit h th e Institu t de s Science s Mathematiques (ISM ) o f Montreal , whos e constituen t members ar e Concordi a University , McGil l University , th e Universite d e Montreal , th e Universit e d u Quebe c a Montreal, an d th e Ecol e Polytechnique .
^ t t E M ^ .
American Mathematical Society Providence, Rhode Island US A
https://doi.org/10.1090/crmm/005
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T h e produc t io n o f this volum e wa s suppor te d i n pa r t b y th e Fond s pou r l a Format io n de Chercheur s e t l 'Aid e a l a Recherch e (Fond s F C A R ) an d th e Na tu ra l Science s an d Engineering Researc h Counci l o f C a n a d a (NSERC) .
1991 Mathematics Subject Classification. Primar y 26A24 ; Secondary 26A21 , 26A27 , 26A48 .
Library o f Congres s Cataloging-in-Publicat io n D a t a
Bruckner, Andre w M . Differentiation o f rea l functions/Andre w Bruckner.—[2n d ed. ]
p. cm.—(CR M monograp h series ; v . 5 ) Includes bibliographica l reference s an d indexes . ISBN 0-8218-6990- 6 1. Calculus , Differential . 2 . Function s o f rea l variables . I . Title . II . Series .
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Table o f Content s
Preface t o th e Secon d Editio n i x
Preface x i
Introduction 1
Premilinaries 3
Chapter 1 . Darbou x Function s 5
1. Example s o f Darboux Function s 5 2. Remark s 5 3. Darbou x function s an d continuit y 6 4. Operations , combinations , an d approximation s 6 5. Additiona l remark s 7
Chapter 2 . Darbou x Function s i n the Firs t Clas s o f Baire 9 1. Equivalence s 9 2. Example s 1 1 3. Operations , combination s an d approximation s 1 2 4. Th e clas s o f derivatives : preliminar y comparison s wit h VBi 1 4 5. Approximat e continuit y 1 5 6. Th e Luzin-Menchof f Theore m an d construction s o f approximatel y
continuous function s 2 0 7. MaximofF s Theorem s 2 6 8. Integra l comparison s o f C, Cap, A' , an d VB\ 2 6 9. Remark s 3 1
Chapter 3 . Continuit y an d Approximat e Continuit y o f Derivatives 3 3 1. Example s o f discontinuous derivative s 3 3 2. Characterizatio n o f the se t o f discontinuitie s o f a derivative 3 4 3. Approximat e continuit y o f the derivativ e 3 5 4. A relationship betwee n C ap an d A ' 3 6
Chapter 4 . Th e Extrem e Derivate s o f a Functio n 3 9 1. Definition s an d basi c propertie s 3 9 2. Measurabilit y an d Bair e classification s o f extreme derivate s 4 0 3. A Darboux-like propert y o f Din i derivative s 4 3 4. Relationship s amon g th e derivate s 4 5
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vi TABL E O F CONTENT S
Chapter 5 . Reconstructio n o f the Primitiv e 5 1 1. Reconstruction s b y Rieman n o r Lebesgu e integratio n 5 1 2. Reconstructio n o f the primitiv e whe n it s derivativ e i s finite 5 2 3. Ambiguitie s whe n derivative s ca n b e infinit e 5 6 4. Generalize d bounde d variatio n an d generalize d absolut e continuit y 5 7
Chapter 6 . Th e Zahorsk i Classe s 6 1 1. Definition s an d basi c propertie s 6 1 2. Derivative s an d th e classe s 6 2 3. Relate d condition s 6 6
Chapter 7 . Th e Proble m o f Characterizin g Derivative s 6 9 1. Associate d set s 7 0 2. Perfec t system s 7 0 3. A n analogu e t o characterizin g integral s 7 2 4. A characterization o f A ' 7 2 5. Miscellaneou s remark s 7 5
Chapter 8 . Derivative s a.e . an d Generalization s 7 7 1. Derivative s a.e . 7 7 2. A generalized derivativ e 7 9 3. Universa l generalize d antiderivative s 8 1 4. Differentiabilit y a.e . 8 3
Chapter 9 . Transformation s vi a Homeomorphism s 8 5 1. Differentiabilit y vi a inne r homeomorphism s 8 5 2. Differentiabilit y vi a oute r homeomorphism s 9 0 3. Derivative s vi a inne r homeomorphism s 9 2 4. Derivative s vi a oute r homeomorphism s 9 5 5. Summar y an d miscellaneou s remark s 9 8
Chapter 10 . Generalize d Derivative s 10 1 1. Th e approximat e derivative—basi c propertie s 10 1 2. Behavio r o f approximate derivative s 10 3 3. Miscellan y 11 0 4. Othe r generalize d derivative s 11 2
Chapter 11 . Monotonicit y 11 9 1. Som e historica l backgroun d fo r Sectio n 2 11 9 2. A genera l theore m 12 1 3. Application s o f Theorem 2. 5 12 5 4. Monotonicit y condition s i n term s o f extreme derivate s 12 8 5. Monotonicit y whe n D+F € # i 13 0 6. Convexit y 13 1
Chapter 12 . Stationar y an d Determinin g Set s 13 5 1. Th e stationar y an d determinin g set s fo r certai n classe s 13 5 2. Miscellaneou s remark s 13 9
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TABLE O F CONTENT S vi i
Chapter 13 . Behavio r o f Typica l Continuou s Function s 14 1 1. Preliminarie s an d basi c terminolog y 14 1 2. Differentiabilit y structur e o f typica l continuou s function s 14 2 3. Horizonta l leve l sets 14 4 4. Tota l leve l set structur e 14 6 5. Miscellaneou s comment s 14 8
Chapter 14 . Miscellaneou s Topic s 15 1 1. Restrictiv e differentiabilit y propertie s o f functions 15 1 2. Extension s t o derivative s 15 2 3. Th e se t o f points o f differentiability o f a functio n 15 4 4. Derivatives , approximat e continuity , an d summabilit y 15 5 5. Additiona l topic s 15 6
Chapter 15 . Recen t Development s 15 7 1. Pat h derivative s 15 7 2. Th e algebr a generate d b y A ' 16 2 3. Mor e abou t typica l behavio r 16 5 4. Miscellan y 16 9
Bibliography 18 1
Supplementary Bibliograph y 18 9
Terminology Inde x 19 3
Notational Inde x
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Preface t o th e Secon d Editio n
Since th e appearanc e o f th e firs t editio n o f thi s boo k i n 1978 , substantia l ad -vances hav e bee n achieve d i n a numbe r o f area s relate d t o th e differentiatio n o f real functions . I t seeme d appropriat e t o ad d a chapte r t o summarize som e of thes e advances. W e hav e attempte d t o suppl y suc h a summar y i n Chapte r 15 . W e limi t this summar y t o ne w wor k tha t extends , o r i s otherwis e closel y connecte d to , th e material tha t appeare d i n th e origina l edition . Eve n here , w e cit e onl y a fractio n of the man y releven t ne w works .
Where convenient , w e provide a n outline o f a new development , stat e ne w the -orems i n detai l an d provid e example s an d proofs . Bu t ofte n th e require d technica l machinery to do this is prohibitive fo r our purpose. I n such cases, we limit ourselve s to indication s o f developments o r results .
The origina l fourtee n chapter s remai n essentiall y unchanged . W e correcte d typographical errors , an d mad e othe r mino r changes .
The manuscrip t wa s abl y type d b y Caroly n Johnson , Phylli s Claudi o an d m y wife Judy , wh o als o helpe d considerabl y wit h th e writin g o f Chapte r 15 . Man y mathematicians spotte d numerou s typographica l errors . Thi s was particularly tru e of Ja n Mafi k an d Ti m Steele , whos e shar p eye s caugh t man y error s tha t woul d otherwise hav e slippe d b y unnoticed . T o al l thes e people , I a m grateful .
Santa Barbar a August, 199 3
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Preface
It ha s no w bee n abou t fort y year s sinc e th e publicatio n o f Saks ' book , Theory of the Integral, a book which deals considerably wit h topics which are related to dif-ferentiation theory . Sinc e that time , particularly sinc e the publication o f Zahorski' s paper [216 ] in 1950 , much work has been don e related t o th e differentiation o f rea l functions, bu t littl e o f i t ha s appeare d i n book form .
A consequenc e o f this i s that man y result s hav e bee n reprove d o r rediscovere d several times. I n addition, there ar e many instances of an author proving a theore m "from scratch" , tha t is , withou t th e knowledg e o f relate d result s whic h existe d a t the time , an d whic h could have been used t o prove the theorem much more simply . It therefor e seem s desirabl e t o hav e a boo k whic h
1. provide s a relativel y efficien t developmen t o f th e presen t stat e o f knowl -edge o n th e subject ,
2. discusse s som e o f the ope n problem s whic h ar e wort h investigatin g , an d 3. provide s reference s t o wor k o n topic s whic h th e boo k doesn' t develo p i n
detail. These are the main purposes of the present Notes . I t i s an outgrowth o f courses
and seminar s whic h w e hav e give n from time-to-tim e durin g th e las t fiftee n year s at th e Universit y o f California , Sant a Barbara .
In orde r t o kee p thi s wor k t o manageabl e proportions , w e hav e ha d t o mak e certain compromises . W e ten d t o omi t proof s o f thos e theorem s whic h ar e eithe r readily accessibl e i n standar d books , o r whic h ar e periphera l t o ou r work . O n occasion, whe n severa l theorem s hav e simila r proofs , w e prov e onl y on e o r tw o of thes e theorems . Wher e w e d o no t giv e a complet e proof , however , w e provid e references.
In puttin g thi s boo k together , w e hav e benefite d fro m discussion s wit h man y students an d colleagues . Particula r thank s ar e du e t o Stev e Agronsky , Rober t Biskner an d Donal d Hancoc k wh o hav e carefull y rea d th e entir e manuscrip t an d made helpfu l suggestions . W e als o wis h t o than k Ms . Soni a Ospin a wh o type d the manuscrip t quickl y an d efficiently , an d deal t wit h th e whim s o f th e autho r cheerfully.
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Terminology Inde x
(Main reference s t o technica l terms )
approximate continuit y associated se t Banach's conditio n T 2 bilateral extrem e
derivate
congruent derivative s
Ch. 2 Ch. 7 Ch. 1 1
Ch. 4
Ch. 1 0 contraction o f a sequenc e
of interval s of set s of sets (regular )
convergent interva l function
Csaszar's derivativ e Darboux functio n
density density cove r
derivative o f Pompei u determining se t
5-differentiable
Dini derivative s External Intersectio n
Condition Garg's derivativ e
Ch. 2 Ch. 2
Ch. 2
Ch. 7 Ch. 1 0 Ch. 1
Ch. 2
Ch. 6 Ch. 2
Ch. 1 2
Ch. 1 5
Ch. 4
Ch. 1 5
Ch. 1 0
§5
§1 §2
§1 §4(d)
§5 §8
§8
§4 §4(c)
§5
§3 §6
§1
§1
§1 §4(h)
monotonic typ e nonangular
nonporous oscillation path derivativ e perfect roa d perfect syste m porosity preponderant continuit y preponderant derivativ e qualitative derivativ e reduction theore m
relative derivativ e restrictive set s
selective derivativ e cr-porous strong porosit y
symmetric derivativ e system o f path s stationary se t typical weakly differentiabl e
Ch. 1 3 § 1 Ch. 1 3 § 1
Ch. 1 5 § 1 Ch. 5 § 4 Ch. 1 5 § 1 Ch. 2 § 1 Ch. 7 § 2 Ch. 1 5 § 2 Ch. 1 0 § 4
Ch. 1 0 §4(a ) Ch. 1 0 §4(b ) Ch. 1 5 § 1 Ch. 1 0 §4(f )
Ch. 1 2 §2(b ) Ch. 1 0 §4(h )
Ch. 1 5 § 3
Ch. 1 5 § 2
Ch. 1 0 §4(e )
Ch. 1 5 § 1 Ch. 1 2 Ch. 1 3 Ch. 1 0 §4(h )
generalized absolut e
continuity Ch . 5 § 4 generalized bounde d
variation Ch . 5 § 4 Hamel basi s Ch . 1 § 1
maximal additiv e famil y Ch . 2 § 3 maximal multiplicativ e
family Ch . 2 § 3
193
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2014-09-11T12:30:54+0530Preflight Ticket Signature