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Description
The Price of CakeBy: Clment Deslandes, Guillaume Deslandes Illustrator: Laure Mac de Lpinay Ingeniously designed mathematical riddles to delight armchairand seasonedmathematicians, in high school and beyond. In The Price of Cake, brothers Clment and Guillaume Deslandes have assembled a uniquely rich and accessible collection of mathematical riddles, organized by difficulty and accompanied by unique hand drawn illustrations. The challenges are exceptional in both their
By: Clément Deslandes, Guillaume Deslandes | Illustrator: Laure Macé de LépinayIngeniously designed mathematical riddles to delight armchair—and seasoned—mathematicians, in high school and beyond.
In The Price of Cake, brothers Clément and Guillaume Deslandes have assembled a uniquely rich and accessible collection of mathematical riddles, organized by difficulty and accompanied by unique hand-drawn illustrations. The challenges are exceptional in both their range and their precision. There are no “tricks” here—just good math to test your skills.
While any student will be thrilled to encounter fresh presentations of classic conundrums such as Simpson’s paradox, Hilbert's infinite hotel, Monty Hall’s paradox, and Seven Bridges of Königsberg, seasoned solvers will also appreciate challenging original puzzles using the Axiom of Choice and Conway’s Soldiers problem. The Deslandes’ lucid and elegant solutions offer new insights, as they seamlessly connect the skills applied in each problem to broader theoretical revelations. Moreover, as Fields Medalist Cédric Villani writes in his preface, these riddles are much more than just exercises. They capture “a certain dose of decorum and mystery,” and to decipher them will require both imagination and tenacity.
To aid you on this journey, the authors provide hints to each puzzle, detailed proofs and solutions, and a series of Math Refreshers to revisit important concepts that are used to arrive at those answers. Entertaining and rigorous in equal measure, The Price of Cake is bound to captivate mathematics enthusiasts and students of all levels.
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4.0 ★★★★★
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Product Reviews
★★★★★ 5
Hydrated
Color: Collagen, Size: 1.69 Fl Oz (Pack of 1)
I’ve been using Bio Dance cream and it feels very moisturizing and soothing on my skin. The texture is smooth, lightweight, and absorbs nicely without feeling too greasy. My skin feels softer and more hydrated after using it, especially when my skin feels dry or tired. It also works well under makeup and gives a healthy glow. A great cream for keeping the skin calm and hydrated.
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Reviewed in the United States on May 10, 2026
★★★★★ 5
Absolutely LOVE this product and product line!!!
Color: Collagen, Size: 1.69 Fl Oz (Pack of 1)
Love it! I have noticed that buy using this entire system my skin looks plump - i.e. super hydrated!! I would agree that the product plumps (no weird tingling type of plumping). I have noticed that my pores do appear slightly smaller. This does leave your skin feeling slightly sticky, but it goes away once it has dried or soaked in. The sticky is not sticky it's more like your hair might stick to it a little bit. It does not last long and that factor also depends on how much product you are putting on. in the morning, I do a thinner layer of the cream. At night I put a thicker layer on. This product when used with the system makes my skin feel and look very soft, hydrated, and glowy. I have sensitive skin and I have no issues with irritation. In fact, I have acne prone skin, and my acne has fully cleared up since I began using this product line a month ago.
I LOVE and will continue to use! Highly recommend!
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Reviewed in the United States on March 5, 2026
★★★★★ 5
Works wonders for my hormonal acne!
Color: Collagen, Size: 1.69 Fl Oz (Pack of 1)
I have had the worst hormonal acne since turning 30, but this has made my pores shrink and cleared up my acne! I even went as far as not ordering it for a few weeks, and my skin looks rough again. I’m writing this review as I just added it to my cart for the second time. I do not want to go without it again. It’s super lightweight. It absorbs beautifully, and my skin glows afterwards. I’ve even been able to go without makeup, because of it and I want to cry tears of joy! It is so hydrating, but doesn’t leave a greasy residue like other products I have tried. Definitely worth the money!!
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Reviewed in the United States on April 4, 2026
★★★★★ 4
great glow on skin
Color: Collagen, Size: 1.69 Fl Oz (Pack of 1)
love the way it makes my skin feel after. it is a little sticky when first applying, but gives a great glow on my face and makes it feel hydrated, definitely worth the money.
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Reviewed in the United States on April 6, 2026
★★★★★ 5
Great for smoother skin and refined pores
Color: Collagen, Size: 1.69 Fl Oz (Pack of 1)
I’ve been using this product consistently and I’m really impressed with the results. The texture is lightweight, absorbs quickly, and doesn’t feel sticky or heavy on the skin. My pores look more refined, and my skin feels smoother and more hydrated. It works well under makeup and hasn’t caused any irritation or breakouts. A little goes a long way, so the bottle lasts quite a while. Definitely a great addition to a skincare routine, especially if you’re looking to improve skin texture and overall appearance.
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Reviewed in the United States on February 6, 2026
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