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Pascal's Arithmetical Triangle: The Story of a Mathematical Idea"An impressive culmination of meticulous research into original sources, this definitive study constitutes the first full length history of the Arithmetic Triangle." Mathematics of Computation Pascal's Arithmetical Triangle was named for the seventeenth century French philosopher mathematician Blaise Pascal, though he did not invent it. A never ending equilateral triangle of numbers that follow the rule of adding the two numbers above to get the
"An impressive culmination of meticulous research into original sources, this definitive study constitutes the first full-length history of the Arithmetic Triangle." -- Mathematics of Computation Pascal's Arithmetical Triangle was named for the seventeenth-century French philosopher/mathematician Blaise Pascal, though he did not invent it. A never-ending equilateral triangle of numbers that follow the rule of adding the two numbers above to get the number below, it appears much earlier in the literature of Hindu and Arabic mathematics and continues to fascinate Western mathematicians. Two sides are comprised of "all 1s," and because the triangle is infinite, there is no "bottom side." This book by A. W. F. Edwards, Professor of Biometry at the University of Cambridge, explores Pascal's Arithmetical Triangle and the way it has been studied, enjoyed, and used by mathematicians throughout history. "A fascinating book...giving new insights into the early history of probability theory and combinatorics and incidentally providing much stimulating material for teachers of mathematics." -- G. A. Bernard, International Statistical Institute Review "Scrupulously researched . . . carries the reader along in a rewarding manner. It is a scientific who-dun-it and one must admire the author for the scholarly yet unpedantic manner in which he disperses some of the mists of antiquity." -- A. W. Kemp, Biometrics "Recommended not only to historians and mathematicians, but also to students seeking to put some life into the dry treatment of these topics to which they have doubtless been subjected." -- Ivor Grattan-Guinness, Annals of ScienceBinding Type: Paperback
Publisher: Dover Publications
Published: 06/12/2019
ISBN: 9780486832791
Pages: 224
Weight: 0.70lbs
Size: 8.90h x 5.90w x 0.50d
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★★★★★ 5
Good air purifier - make sure you actually unwrap the filter lol
Style: Medium Room Air Purifier
I'm an idiot and didn't realize the filter that comes already inside it was in there wrapped in plastic for some reason that surpasses my understanding (the whole unit was already wrapped in plastic, why is the filter, which is inside the plastic-wrapped unit, also wrapped in its own separate plastic?? As if we need more plastic in the world...). Anyway, I didn't look inside cuz I thought the filter would just be installed in there and I plugged it in and cheerfully ran it for months til it told me it was time for replace the filter then bought a second filter and went tk take my old one out only to realize I hadn't been filtering anything all that time 😅 oops. Lol. So yeah, make sure you unwrap the filter. Otherwise it's a good little air purifier. Now that the filter is actually installed right, I notice it kicks up higher when we cook or do anything that would lower air quality, so it does seem to be detecting that properly! My allergies do seem better overall. It's pretty quiet when it's on low, but does get loud when it kicks up. I'm OK with that since it pretty much only happens when we cook or if I just put out a candle or something.
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Reviewed in the United States on May 3, 2026
★★★★★ 4
Air Purifier
Style: Medium Room Air Purifier
Works well small and compact so it can fit in more areas.
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Reviewed in the United States on April 6, 2026
★★★★★ 1
Not worth it
Style: Medium Room Air Purifier
Disappointed in this air purifier. Doesn't seem to keep the air clean. Air filter needs to be replaced more often than other air purifiers. Unfortunately I can't return this product. Would not recommend this. Buy a Levoit air purifier instead. Works much better and filter doesn't need to be replaced as often.
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Reviewed in the United States on February 18, 2026
★★★★★ 5
Excellent Performance and Very Easy to Change Filter
Style: Medium Room Air Purifier
Very happy with this air purifier! It works really well and you can actually feel the air getting cleaner after running it for a while. It’s quiet, simple to use, and perfect for a medium-sized room. What I especially love is how easy it is to replace the filter. No complicated steps — just open, swap, and done in minutes. Super convenient and stress-free. For the price, the quality is surprisingly good. Definitely worth it, and I would buy again.
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Reviewed in the United States on March 1, 2026
★★★★★ 5
great solid product for the price, easy to use
Style: Medium Room Air Purifier
Bought for a family member to put in his room & it’s been super easy to set up and use. Helps noticeably freshen up the room and keep it smelling better too
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Reviewed in the United States on April 30, 2026