The word-of-mouth bestseller * Published in more than 30 countries * 3 million copies sold worldwide Are you stressed out, overbooked and underwhelmed by life? Fed up with pleasing everyone else before you please yourself? Finding it hard working from home? Then it's time to stop giving a f**k, and care less to get more. This irreverent and practical book explains how to rid yourself of unwanted obligations, shame, and guilt - and give your f**ks instead to people and things that make you happy. From family dramas to having a bikini body, the simple 'NotSorry Method' for mental decluttering will help you unleash the power of not giving a f**k and will free you to spend your time, energy and money on the things that really matter. 'The anti-guru' Observer 'Absolutely blinding. Read it. Do it.' Mail on Sunday 'Genius' Cosmopolitan 'I love Knight's book even before I start reading . . . Works a charm' Sunday Times Magazine 'Life-affirming . . . The key practice she advocates is devising for yourself a "fuck budget" . . . It's a beautiful way of streamlining your psyche' Lucy Mangan, Guardian ALSO AVAILABLE FROM SARAH KNIGHT: YOU DO YOU: how to be who you are and use what you've got to get what you want AND Get Your Sh*t Together - the New York Times bestseller helping you organise the f**ks you want and need to give

This book is a gentle introduction to the enumerative part of combinatorics suitable for study at the advanced undergraduate or beginning graduate level. In addition to covering all the standard techniques for counting combinatorial objects, the text contains material from the research literature which has never before appeared in print, such as the use of quotient posets to study the Möbius function and characteristic polynomial of a partially ordered set, or the connection between quasisymmetric functions and pattern avoidance. The book assumes minimal background, and a first course in abstract algebra should suffice. The exposition is very reader friendly: keeping a moderate pace, using lots of examples, emphasizing recurring themes, and frankly expressing the delight the author takes in mathematics in general and combinatorics in particular.