In algebra, ring theory is the study of rings, algebraic structures in which addition and multiplication are defined and have similar properties to those operations defined for the integers. Ring ...

It's one of the most fundamental problems in mathematics. It had been considered totally out of reach before this.” ...

In mathematics, an associative algebra A over a commutative ring K is a ring A together with a ring homomorphism from K into the center of A. This is thus an algebraic structure with an addition, a ...

Gorgeously designed, easy to wear, long-lasting and full of granular health information, the Oura Ring 4 is nearly the perfect fitness tracker. I loved using it, and will continue to do so ...

I’ve made no secret about wearing the Oura Ring smart ring for many years. I am definitely a fan of the product, as is made clear by this longevity, but don’t take this to mean I’ll go easy ...

Both the Oura Ring 4 and the Galaxy Ring are designed to be worn for extended periods of time, so comfort has to be one of the main considerations. The Oura Ring 4 has a comfortable fit ...

I’m PCMag’s senior analyst covering smart home and wearable devices. I’ve been writing about tech professionally for nearly a decade and have been obsessing about it for much longer than that.

The Oura Ring 4 offers an impressive AI advisor and a sleek, striking design. But in my experience, it plays far more nicely with iPhone than Android. Oura Ring 4 has entered the chat and is here ...

Looks and feels more like jewelry than ever. New Smart Sensing platform makes the ring more accurate and easier to wear. Updated app with interesting new features. Better battery life. Both ...

I wanted to see which was best, and the Oura Ring Gen 3 was the clear winner. Well, it’s been about two weeks since my experiment ended, and there’s now a new winner: the Oura Ring 4.