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Description
TENSORS made easy with SOLVED PROBLEMSNew MARCH 2021 REVISED RELEASE A friendly and non formal approach to a subject of abstract mathematics that has important applications in physics, especially in General Relativity, but also in other fields. The purpose of the book is mainly didactic and requires some mathematical background (differential calculus, partial derivatives included).
-- New MARCH 2021 REVISED RELEASE --
A friendly and non-formal approach to a subject of abstract mathematics that has important applications in physics, especially in General Relativity, but also in other fields.
The purpose of the book is mainly didactic and requires some mathematical background (differential calculus, partial derivatives included).
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4.8 ★★★★★
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Product Reviews
★★★★★ 3
Not great
Size: 2.1 Fl Oz (Pack of 1)
I wish I could give 3 1/2 starts but I have to give it 3 stars for two reasons. 1 is it is not a fine mist, it will leave your face looking crazy after you spray it. You end up having to pay it into your skin because there’s white splotches all over your face. So if you were to apply this with no mirror it would be a problem. Also I feel like it semi defeats the point of using a face spray if you have to use your hands to finish applying it. 2 is that for me it makes my skin feel hot and kinda burn around my mouth area. I think there might be too much fragrance or something. It does go away after awhile but it is not pleasant and I can’t imagine it is good for me.
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Reviewed in the United States on June 7, 2026
★★★★★ 5
Great for summer pool time
Size: 2.1 Fl Oz (Pack of 1)
Gave it 5 stars because it really does its job. I used this sunscreen on my face during the summer when I was going to the pool a lot. It goes on white at first, but once you rub it in well the white cast pretty much disappears. Doesn’t make my face super greasy and protected my skin really well, no burns, no weird tan lines, nothing, as long as I reapplied it like the instructions say. The smell is light and not annoying. The bottle is small and easy to keep in a bag. Overall, a good product that actually works.
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Reviewed in the United States on December 6, 2025
★★★★★ 5
Easy to use, and long-lasting sun protection
Size: 7 Fl Oz (Pack of 2)
Coppertone SPF 30 sunscreen is our go-to for the beach and pool. I also keep a bottle in the truck for when we're doing anything outdoors like tailgating and things of that nature. It's not greasy, it goes on easy, and works exactly as it should. We don't worry about sunburns with this stuff, and it seems to last just fine even after spending time in the water. I can put this on when we first go out onto the beach or the pool in the hot Carolinas sun, and I can spend hours out there without getting burned. I do reapply after a few hours if we're in and out of the water a lot or in the more intense sun further south like in the Caribbean.
To be fair, part of what I like is the nostalgia of using the same brand that my mom slathered on us kids in the 1970's, lol, but in those days sun protection wasn't as important to us as a deep tan was, so we'd still burn. Modern day Coppertone makes sun protection their priority, and I don't know of a better sunscreen that's as easy to apply and lasts any longer than this one. Is it possible to get a tan while using this product? Sure, but it takes longer and that's fine - because I rarely burn at all when using it, and that's the whole point.
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Reviewed in the United States on January 31, 2026
★★★★★ 5
no issues.
Size: 7 Fl Oz (Pack of 2)
no issues. good alternative to the $$$$$ brands. i spend a lot of time outside and this seems to be a good solution to blocking the sun's rays.
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Reviewed in the United States on June 7, 2026
★★★★★ 5
Great product! Works
Size: 7 Fl Oz (Pack of 2)
Great smell and worked! Who doesn't like Coppertone?
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Reviewed in the United States on March 30, 2026
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