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Description
Book of ProofThis book is an introduction to the language and standard proof methods of mathematics. It is a bridge from the computational courses (such as calculus or differential equations) that students typically encounter in their first year of college to a more abstract outlook. It lays a foundation for more theoretical courses such as topology, analysis and abstract algebra. Author: Richard H. Hammack Publisher: Richard Hammack Published: 07 19 2019 Pages:
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Best in 7 days
Best in 7 days
Best in 7 days
Best in 7 days
4.1 ★★★★★
Based on 710 reviews
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Product Reviews
★★★★★ 5
👍🏻
My husband and I really like this set it works very well for both of us
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Reviewed in the United States on December 23, 2025
★★★★★ 5
Bad poors
I have bad poor and this deep cleans it good and leaves my face refreshed and soft
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Reviewed in the United States on July 20, 2025
★★★★★ 3
It’s so invisible
So basically, I am 15 I accidentally went to my school in these but during free period my friend told me I was so embarrassed because at that point all the moisture became out of it and it was very visible. It’s not a bad product just to make sure to take it off before school/work.
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Reviewed in the United States on July 28, 2025
★★★★★ 5
Skin care for Mature Skin
I have Mature skin. I have tried many products to no avail. These 3 Korean products did my skin wonders on day 1. My very favorite is the Oil Cleaner. 2 are the toner pads that have Collagen Peptides and Rice Water. They're thin and you really can place them on your face like a sheet mask. Amazing! 3 the Pore Minimizer Serum shrank the large pores on each side of my nose. It leaves my skin So Pretty that I don't wear makeup but on special occasions. The price is a steal also.
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Reviewed in the United States on November 15, 2024
★★★★★ 5
Unbelievable results even for a skeptic like me!
I honestly don't know what witchcraft this brand uses, but I was given their eye patches as a gift and could not believe how well they worked. I am hugely skeptical, usually only believe really in actual Botox, plastic surgery, etc. So I thought the eye patches would be a waste of time. But I put them one one morning when my under eye area was all wrinkled and dried up like a prune. They were MAGIC. Then recently I saw these masks and thought I'd better try them. I have EXTREMELY SENSITIVE skin, to the point where I need regular dermatological care and can't use ANYTHING on my face. My cheeks burn and are red and like sandpaper ALL the time. But I put this mask on around 7 AM when my skin was at its most calm and non-red. I left it on for about 50 mins. Unbelievable results. My whole face is moisturized, nothing hurts, everything looks tight but feels lovely. Really impressed. I'll try to take pics next time and edit this.
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Reviewed in the United States on April 24, 2026
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