Skip to main content

Visit the Observer

Compare
Wish List
Sign In
Sign Up

Search

Books
- Books
- View All
- Fiction
- Non-fiction
- Children's
- Crime, thrillers & true crime
- View All
- Crime & mystery
- Thriller & suspense
- Graphic novels, manga & comics
- View All
- Cartoons
- Comic books
- Graphic novels
- Manga
- Modern & contemporary
- View All
- Adventure & action
- Humorous fiction
- Romance
- View All
- Erotic fiction
- Historical romance
- Modern & contemporary
- Saga & family life fiction
- Art, photography & architecture
- View All
- Architecture
- Art forms
- Fashion
- General Art
- History of art & design
- Photography
- Biography & memoir
- View All
- Arts & entertainment biography
- Business biographies
- Diaries, letters and journals
- Historical & political biographies
- Journalism & collected columns
- Literary biographies
- Memoirs
- Royal biographies
- Sport biographies
- True stories
- Current affairs & politics
- View All
- Elections & referenda
- Human rights & political activism
- International relations
- Political biographies
- Political ideologies & movements
  - View All
  - Green & ecopolitics
- Political parties
- Political structure & processes
- Environment
- View All
- Climate change
- Conservation of the environment
- General environment
- Natural disasters
- Sustainability
- Urban & rural planning
- Health & wellbeing
- View All
- Ageing
- Diabetes
- Fitness & diet
- Health conditions
- Menopause
- Mental health
- Mind, body & spirit
- Mindfulness
- Personal, social & health topics
- Nature & the natural world
- View All
- Astronomy & space
- Dinosaurs
- Earth sciences
- Environments
- Geography
- Pets
- The countryside & country life
- Trees & plants
- Weather & climate
- Wildlife
- Popular science
- View All
- Popular astronomy
- Popular economics
- Popular mathematics
- Popular medicine & health
- Popular psychology
- Self help
- View All
- Mindfulness
- Personal development
- Practical advice
- Society & culture
- View All
- Education
- Feminism & feminist theory
- LGBTQ+ studies
- Media studies
- Race & racism
- Sex, sexuality & gender
- Social & ethical issues
- Sociology & anthropology
- Children's fiction
- View All
- Action & adventure
- Biographies & true stories
- Classic stories
- Crime & thriller
- Family & home stories
- Funny stories
- Horror & ghost stories
- Nature & animals
- Relationship stories
- Short stories
- Children's reference
- View All
- Atlases & maps
- Dictionaries & languages
- Encyclopaedias
- Education & learning aids
- View All
- Arts
- Business studies & economics
- History & social sciences
- Maths
- Sciences
- Study & revision guides
- Personal & social develpoment
- View All
- Body & health
- Careers & further education
- Disability & special needs
- Emotions, feelings & behaviours
- Families & relationships
- Growing up
- LGBTQ+ & gender identity
- Physical & mental health conditions
- Social issues
Books By Subject
- Language and Linguistics_C
- View All
- Language: reference and general_CB
- Linguistics_CF
- Language teaching and learning_CJ
- Biography, Literature and Literary studies_D
- View All
- Ancient, classical and medieval texts_DB
- Poetry_DC
- Plays, playscripts_DD
- Biography and non-fiction prose_DN
- Literature: history and criticism_DS
- History and Archaeology_N
- View All
- History_NH
- Archaeology_NK
- Mathematics and Science_P
- View All
- Mathematics_PB
- Science: general issues_PD
- Astronomy, space and time_PG
- Physics_PH
- Chemistry_PN
- Biology, life sciences_PS
- Philosophy and Religion_Q
- View All
- Philosophy_QD
- Religion and beliefs_QR
- Reference, Information and Interdiscipli_G
- View All
- Encyclopaedias and reference works_GB
- Library and information sciences / Museo_GL
- Research and information: general_GP
- Interdisciplinary studies_GT
- Earth Sciences, Geography, Environment, Planning_R
- View All
- Earth sciences_RB
- Geography_RG
- The environment_RN
- Regional and area planning_RP
- Society and Social Sciences_J
- View All
- Society and culture: general_JB
- Sociology and anthropology_JH
- Social services and welfare, criminology_JK
- Psychology_JM
- Education_JN
- Politics and government_JP
- Warfare and defence_JW
- Economics, Finance, Business and Management_K
- View All
- Economics_KC
- Finance and accounting_KF
- Business and Management_KJ
- Industry and industrial studies_KN
- Health, Relationships and Personal development_V
- View All
- Family and health_VF
- Self-help, personal development and prac_VS
- Mind, body, spirit_VX
- Graphic novels, Comic books, Manga, Cartoons_X
- View All
- Graphic novel / Comic book / Manga: styl_XA
- Graphic novel / Comic book / Manga: genr_XQ
- Graphic novel / Comic book / Manga: Refe_XR
- Strip cartoons_XY
- Place qualifiers_1
- View All
- World_1A
- Europe_1D
- Asia_1F
- Africa_1H
- The Americas_1K
- Australasia, Oceania, Pacific Islands, A_1M
- Other geographical groupings: Oceans and_1Q
- Space, planets and extraterrestrial loca_1Z
- Time period qualifiers_3
- View All
- Geological time_3A
- Prehistory_3B
- BCE period � Protohistory_3C
- CE period up to c 1500_3K
- c 1500 onwards to present day_3M
- Educational purpose qualifiers_4
- View All
- For all educational levels_4C
- For international curricula and examinat_4G
- For language learning courses and examin_4L
- For specific educational purposes_4T
- For specific national or regional educat_4Z
- Style qualifiers_6
- View All
- Styles (A)_6A
- Styles (B)_6B
- Styles (C)_6C
- Styles (D)_6D
- Styles (E)_6E
- Styles (F)_6F
- Styles (G)_6G
- Styles (H)_6H
- Styles (IJ)_6J
- Styles (K)_6K
- Styles (L)_6L
- Styles (M)_6M
- Styles (NO)_6N
- Styles (P)_6P
- Styles (Q)_6Q
- Styles (R)_6R
- Styles (S)_6S
- Styles (T)_6T
- Styles (U)_6U
- Styles (V)_6V
- Styles (W)_6W
- Styles (XYZ)_6X
- The arts: general topics_AB
- View All
- Theory of art_ABA
- Conservation, restoration and care of ar_ABC
- Forgery, falsification and theft of artw_ABK
- Art: financial aspects_ABQ
- Language: reference and general_CB
- View All
- Dictionaries_CBD
- Bilingual and multilingual dictionaries_CBDX
- Thesauri_CBF
- Usage and grammar guides_CBG
- Speaking in public: advice and guides_CBP
- Creative writing and creative writing gu_CBV
  - View All
  - Screenwriting techniques_CBVS
- Writing and editing guides_CBW
- Language: history and general works_CBX
- Ancient, classical and medieval texts_DB
- View All
- Ancient Sagas and epics_DBS
- Plays, playscripts_DD
- View All
- Classic and pre-20th century plays_DDA
- Modern and contemporary plays (c 1900 on_DDC
- Comedic plays_DDL
- Tragic plays_DDT
- Monologues / Duologues_DDV
- Pre-clinical medicine: basic sciences_MF
- View All
- Anatomy_MFC
- Physiology_MFG
- Human reproduction, growth and developme_MFK
- Medical genetics_MFN
- Medical study and revision guides and re_MR
- View All
- Medical study, exam preparation and revi_MRG
- Medical guidelines / Clinical guidelines_MRP
- Medical charts, colour atlases_MRT
- Complementary and alternative medicine a_MX
- View All
- Chiropractic and osteopathy_MXH
- Animal-assisted therapy_MXN
- Fiction: general and literary_FB
- View All
- Modern and contemporary fiction: general_FBA
  - View All
  - Street fiction / urban fiction_FBAN
- Classic fiction: general and literary_FBC
- Speculative fiction_FD
- View All
- Dystopian and utopian fiction_FDB
- Alternative history fiction_FDK
- Afrofuturism / Black Speculative fiction_FDM
- Metaphysical / philosophical fiction_FDV
- Thriller / suspense fiction_FH
- View All
- Espionage and spy thriller_FHD
- Technothriller_FHK
- Medical thriller_FHM
- Political / legal thriller_FHP
- Esoteric thriller_FHQ
- Thriller: organised crime_FHR
- Thriller: serial killers_FHS
- Thriller: terrorism_FHT
- Psychological thriller_FHX
- Adventure / action fiction_FJ
- View All
- Martial arts fiction_FJD
- Historical adventure fiction_FJH
- War, combat and military adventure ficti_FJM
- Sea stories_FJN
- Adventure fiction: Westerns_FJW
- Horror and supernatural fiction_FK
- View All
- Classic horror and ghost stories_FKC
- Contemporary horror and ghost stories_FKM
- Occult fiction_FKW
- Fiction: Traditional stories, myths and _FN
- View All
- Fairy and Folk tales / Fairy tale retell_FNF
- Myths and Legends / Mythic fiction_FNM
- Humorous fiction_FU
- View All
- Satirical fiction and parodies_FUP
- Encyclopaedias and reference works_GB
- View All
- General encyclopaedias_GBA
- Reference works_GBC
- Miscellanies and compendia_GBD
- Library and information sciences / Museo_GL
- View All
- Library, archive and information managem_GLC
  - View All
  - Information retrieval and access_GLCA
- IT, Internet and electronic resources in_GLF
- Acquisitions and collection development_GLH
- Bibliographic and subject control_GLK
- Library and information services_GLM
- Archiving, preservation and digitization_GLP
- Museology and heritage studies_GLZ
- Research and information: general_GP
- View All
- Information theory_GPF
  - View All
  - Cybernetics and systems theory_GPFC
- Data science and analysis: general_GPH
- Coding theory and cryptology_GPJ
- Decision theory: general_GPQ
  - View All
  - Risk assessment_GPQD
- Research methods: general_GPS
- Regional and area planning_RP
- View All
- Urban and municipal planning and policy_RPC
- Rural planning and policy_RPG
- Transport planning and policy_RPT
- Sociology and anthropology_JH
- View All
- Sociology_JHB
- Anthropology_JHM
  - View All
  - Social and cultural anthropology_JHMC
- Athletics, gymnastics and related sports_SH
- View All
- Track and field sports, athletics_SHB
- Gymnastics_SHG
- Weightlifting_SHP
- Equestrian and animal sports_SK
- View All
- Horse racing_SKG
- Riding, showjumping and horsemanship_SKL
- Dog racing_SKR
- Water sports and recreations_SP
- View All
- Swimming and diving_SPC
- Surfing, windsurfing, water skiing_SPG
- Boating: Sport and leisure_SPN
- Combat sports and self-defence_SR
- View All
- Boxing_SRB
- Wrestling_SRC
- Fencing_SRF
- Martial arts_SRM
- Winter sports_ST
- View All
- Skiing_STA
- Snowboarding_STC
- Ice-skating_STG
- Speed skating_STH
- Figure skating_STJ
- Ice hockey_STK
- Sledding_STL
  - View All
  - Sled dog racing_STLN
- Curling_STP
- Field sports: fishing, hunting, shooting_SV
- View All
- Falconry and hawking_SVB
- Fishing, angling_SVF
- Hunting or shooting animals and game_SVH
  - View All
  - Professional qualifications for hunting _SVHH
- Archery_SVR
- Small firearms, guns and other equipment_SVS
- Target shooting_SVT
- Other sports and competitive activities_SX
- View All
- Bodybuilding_SXB
- Darts_SXD
- eSports / Professional video gaming_SXE
- Extreme sports_SXQ
- Active outdoor pursuits_SZ
- View All
- Walking, hiking, trekking_SZC
- Cycling: general and touring_SZD
- Running and jogging_SZE
- Climbing and mountaineering_SZG
- Orienteering_SZK
- Caving and potholing_SZN
- Camping_SZR
- Outdoor survival skills_SZV
- Information technology: general topics_UB
- View All
- History of Computing, digital and inform_UBB
- Digital and information technologies: He_UBH
- Digital and information technologies: so_UBJ
- Digital and information technologies: Le_UBL
- Maker and hacker culture_UBM
- Internet: general works_UBW
- Graphical and digital media applications_UG
- View All
- Accessibility in web and digital design_UGA
- Web graphics and design_UGB
- Computer-aided design (CAD)_UGC
- Desktop publishing_UGD
- Computer games design_UGG
- 3D graphics and modelling_UGK
- Illustration and drawing software_UGL
- Digital music: professional_UGM
- Digital animation_UGN
- Photo and image editing_UGP
- Digital video: professional_UGV
- Computer certification_UQ
- View All
- Computer certification: Microsoft_UQF
- Computer certification: Cisco_UQJ
- Computer certification: ECDL_UQL
- Computer certification: CompTIA_UQR
- Computer certification: CLAiT_UQT
- Computer security_UR
- View All
- Privacy and data protection_URD
- Computer fraud and hacking_URH
- Computer viruses, Trojans and worms_URJ
- Firewalls_URQ
- Spam_URS
- Spyware_URW
- Data encryption_URY
- Computer networking and communications_UT
- View All
- Cloud computing_UTC
- Client�Server networking_UTD
- System administration_UTE
- Network management_UTF
  - View All
  - Computer systems back-up and data recove_UTFB
- Grid computing_UTG
- Electronic mail (email): professional_UTM
- Network security_UTN
- Networking standards and protocols_UTP
- Distributed systems_UTR
- Networking packages_UTS
- Virtualization_UTV
- WAP networking and applications_UTW
- EDI (electronic data interchange)_UTX
- Applied computing_UX
- View All
- Computer applications in the arts and hu_UXA
- Computer applications in the social and _UXJ
- Computer applications in industry and te_UXT
- Lifestyle and personal style guides_WJ
- View All
- Fashion and style guides_WJF
- Cosmetics, hair and beauty_WJH
- Perfume and incense_WJJ
- Interior design, decor and style guides_WJK
- Shopping guides_WJS
- Weddings, wedding planners_WJW
- Parties, etiquette and entertaining_WJX
- Traditional rituals and ceremonies_WJY
- Home and house maintenance_WK
- View All
- DIY: general_WKD
- Household management and home hints_WKH
- Home renovation and extension_WKR
- Outdoor and recreational areas: design a_WKU
- Local and family history, nostalgia_WQ
- View All
- Local history_WQH
- Nostalgia: general_WQN
- Places in old photographs_WQP
- Family history, tracing ancestors_WQY
- Stationery and miscellaneous items_WZ
- View All
- Gift books_WZG
- Stationery items_WZS
- Graphic novel / Comic book / Manga: Refe_XR
- View All
- Manga and East Asian style / tradition: _XRM
- Children�s / Teenage poetry, anthologies_YD
- View All
- Children�s / Teenage: Annuals / yearbook_YDA
- Children�s / Teenage: Anthologies_YDC
- Children�s / Teenage: Poetry_YDP
- Children�s / Teenage reference material_YR
- View All
- Children�s / Teenage reference: Dictiona_YRD
- Children�s / Teenage reference: Encyclop_YRE
- Children�s / Teenage reference: Subject-_YRG
- Children�s / Teenage reference: Atlases _YRW
- Children�s / Teenage stationery and misc_YZ
- View All
- Children�s gift books_YZG
- Children�s stationery items_YZS
- Space, planets and extraterrestrial loca_1Z
- View All
- The Solar System_1ZM
- Indic, East Indo-European and Dravidian _2B
- View All
- Early Indic languages_2BB
- Modern Indic languages_2BM
- Dravidian languages_2BR
- Indo-Iranian languages_2BX
- Afro-Asiatic languages_2C
- View All
- Semitic languages_2CS
- Non-Semitic Afro-Asiatic languages_2CX
- Ural-Altaic and Hyperborean languages_2F
- View All
- Finno-Ugric languages_2FC
- Turkic languages_2FM
- Mongolian_2FV
- Tungusic languages_2FW
- Hyperborean and Palaeosiberian languages_2FX
- East and Southeast Asian languages_2G
- View All
- Sino-Tibetan languages_2GD
- Japanese_2GJ
- Korean_2GK
- Other Southeast Asian languages, Austroa_2GR
- Geological time_3A
- View All
- Cenozoic era_3AC
  - View All
  - Quaternary period_3ACF
    - Pleistocene epoch_3ACFB
    - Holocene epoch_3ACFD
- Mesozoic era_0.125
- Palaeozoic era_3AP
- Proterozoic eon_3AR
- Archean and Hadean eons_3AT
- For international curricula and examinat_4G
- View All
- For International Baccalaureate (IB) pre_4GA
- For International Baccalaureate (IB) Dip_4GB
- For International Baccalaureate (IB) Car_4GC
- For International GCSE (IGCSE)_4GH
- For International AS / A level_4GJ
- Subject matter intended exclusively for _5J
- View All
- Subject matter intended specifically for_5JA
- Subject matter intended specifically for_5JB
- Relating to the stages of life_5L
- View All
- Relating to infancy_5LB
- Relating to childhood_5LC
- Relating to preteen / tween years_5LD
- Relating to adolescence / teenage years_5LF
- Relating to adulthood_5LK
- Relating to special / particular aspects_5Y
- View All
- Relating to non-stereotypical gender rol_5YA
- Relating to UN Sustainable Development G_5YS
- Styles (B)_6B
- View All
- Baroque_6BA
- Barbizon school_6BB
- Bauhaus_6BC
- Berliner Sezession_6BD
- Biedermeier_6BF
- Beat style_6BG
- Bebop_6BH
- Der Blaue Reiter_6BJ
- Bloomsbury Group style_6BK
- Bluegrass_6BL
- Blues_6BM
- Die Br�cke_6BN
- Byzantine style_6BP
- Brutalism_6BQ
- Styles (C)_6C
- View All
- Classical style_6CA
- Cubism_6CB
- Celtic style_6CC
- Camden Town Group_6CD
- Cloisonnism_6CF
- CoBrA_6CG
- Color Field painting_6CH
- Computer art_6CJ
- Conceptualism_6CK
- Constructivism_6CL
- Country and Western_6CM
- Cubo-Futurism_6CN
- Colonial style_6CP
- Styles (D)_6D
- View All
- Dada_6DA
- Divisionism_6DB
- D�sseldorf School_6DC
- Styles (F)_6F
- View All
- Fauvism_6FA
- Fado_6FB
- Flamenco_6FC
- Folk, Folkloric styles_6FD
- Futurism_6FF
- Fantasy art_6FG
- Styles (G)_6G
- View All
- Gothic_6GA
- Georgian style_6GB
- Ancient Greek style_6GC
- Gospel style_6GD
- Gauchoesque style (gauchesco)_6GE
- Styles (H)_6H
- View All
- Metal, Heavy Metal_6HA
- Hague School_6HB
- Heidelberg School_6HC
- Styles (IJ)_6J
- View All
- Impressionism_6JA
- Iberian style_6JB
- Indie styles_6JC
- Jazz_6JD
- Jack of Diamonds_6JF
- Jugendstil_6JG
- Islamic styles_6JL
- Indigenous styles_6JN
- Styles (K)_6K
- View All
- K-pop style_6KA
- Styles (L)_6L
- View All
- Lettrism_6LA
- Lyric / Lyrical styles_6LB
- Latin style_6LC
- Styles (NO)_6N
- View All
- Naive style_6NA
- Naturalism_6NB
- Op art, Kinetic art_6NC
- Outsider art, Art brut_6ND
- Orientalism_6NE
- Les Nabis_6NF
- Nazarene_6NG
- Neo-Classicism_6NH
- Neo-impressionism_6NJ
- New age_6NK
- Norwich School_6NL
- Orphism_6NM
- Neorealism_6NN
- New Wave_6NW
- Styles (Q)_6Q
- View All
- Queen Anne style_6QA
- Styles (T)_6T
- View All
- Tango_6TA
- Tachism_6TB
- Tartessian style_6TC
- Transavanguardia_6TE
- Turkish / Ottoman styles_6TF
- Styles (U)_6U
- View All
- Urban / �Street� styles_6UB
- Ukiyo-e_6UC
- Styles (V)_6V
- View All
- Vienna Secession_6VA
- Viking style_6VB
- Visigoth style_6VC
- Vorticism_6VD
- Vernacular_6VE
- Styles (XYZ)_6X
- View All
- Zydeco_6XZ

Sign In Sign Up

Enjoy 20% off your first order with code OBS20 | Free UK delivery on orders over £25

Home
Books By Subject
Mathematics and Science_P
Mathematics_PB
Number theory_PBH

Number theory_PBH

Sort By:

!

Footer Start

Every purchase you make supports the Observer’s journalism—amplifying bold storytelling and progressive perspectives that often go unheard elsewhere. With over 250,000 titles available and free UK shipping on orders over £25, there’s something for everyone.

Visit the Observer

About the Observer Shop
Frequently asked questions
Delivery and returns
Sustainability
Contact us
Cookie policy
Privacy policy
Terms and conditions

Every order supports the Observer's journalism
100% recyclable packaging
Free UK P&P on online orders over £25
Up to 15% off books featured in the Observer
Fast deliveries on books and gifts

020 3176 2930

help@observershop.co.uk

Payment options

© 2025 The Observer Shop

Continue to checkout