This book presents reverse mathematics to a general mathematical audience for the first time. Reverse mathematics is a new field that answers some old questions. In the two thousand years that mathematicians have been deriving theorems from axioms, it has often been asked: which axioms are needed to prove a given theorem? Only in the last two hundred years have...

Elements of Mathematics takes readers on a fascinating tour that begins in elementary mathematics—but, as John Stillwell shows, this subject is not as elementary or straightforward as one might think. Not all topics that are part of today's elementary mathematics were always considered as such, and great mathematical advances and discoveries had to occur in order for certain subjects to...

How the concept of proof has enabled the creation of mathematical knowledge. The Story of Proof investigates the evolution of the concept of proof—one of the most significant and defining features of mathematical thought—through critical episodes in its history. From the Pythagorean theorem to modern times, and across all major mathematical disciplines, John Stillwell demonstrates that proof is a mathematically...

The first book surveying the history and ideas behind reverse mathematics, Reverse Mathematics is a new field that seeks to find the axioms needed to prove given theorems. In Reverse Mathematics, John Stillwell offers a historical and representative view, emphasizing basic analysis and providing a novel approach to logic. By using a minimum of mathematical logic in a well-motivated way,...

Romance, danger, and intrigue await you in the breathtaking sixth book in the #1 bestselling Court of Thorns and Roses (ACOTAR) series.What was broken will be remade.Deep in the heart of the continent, Koschei the Deathless is stirring. Though he's been bound to a mountain lake for millennia, the insidious threat of his return now spreads across the Fae territories,...

Bring Christmas closer one day at a time with this show-stopping Wasgij Advent Calendar - Christmas TV Special! There are 24 doors to open, each with its own 54-piece puzzle inside. It’s the busiest time of the year for Santa, not only because of all the presents he needs to deliver, but also because of the countless movies and TV...

Join the clicking fun with all new Clickeez. Each Clickee is a single keyboard key that clicks & clacks just like a real keyboard! You can connect your favourite characters together to create your own keychain and take them on the go. Series 3 features an all-new POP click sound and a new rounded shape! The Series 3 2-Pack includes...

The brand new Gruffalo picture book from Julia Donaldson and Axel Scheffler. The Gruffalo said to his daughter one day, "Your Gruffalo Granny is coming to stay." Return to the deep dark wood with the first new Gruffalo story in over 20 years, and meet Gruffalo Granny as she visits the Gruffalo family. This fresh and exciting new Gruffalo adventure...

Brain Box - Maximum Electronic Kit offers 500 Experiments/Projects designed to teach principles of Electronics and Electricity. This kit enables experiments and kit building with ease, requiring practically no tools. The easy-to-handle components snap together to create a vast array of different circuits on the base board, providing many hours of fun while learning. The process of building the circuits...

From Jacob Tierney, the creator of Heated Rivalry, in partnership with Brendan Brady and Accent Aigu, comes I’ll Believe in Anything, an official and complete collection of annotated scripts for the biggest cultural sensation of the year, with all new exclusive behind-the-scenes content.Based on Rachel Reid’s blockbuster Game Changers book series, Heated Rivalry premiered on Crave and HBO in late 2025 and immediately took the world by storm. I’ll...

A lighter, swifter version of the award-winning Wingspan. Wingspan – Pocket Edition distils the Wingspan experience down to a lighter, shorter, card-driven game that has each player activate a single row of cards on each of their turns. The cards are all double sided: a food side and a bird side. Bird powers are primarily indicated by icons instead of...

The next book in the blockbuster Empyrean series, Threshing Day contains thirteen stories starring your favorite characters and their dragons. The deluxe first edition includes sixteen beautiful original full-color illustrations by artist Joe Requeza.    Rebecca Yarros is the #1 New York Times, USA Today, and Wall Street Journal bestselling author of over twenty novels, including Fourth Wing and In the...