In mathematics, a Noetherian ring is a ring that satisfies the ascending chain condition on left and right ideals; if the chain condition is satisfied only for left ideals or for right ideals, then ...

Named after German mathematician Emmy Noether (1882–1935). In this chapter the focus moves from semiprime rings to general Noetherian rings, although it does concentrate on prime and semiprime ideals.

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 ...

The arrival of the Oura Ring 4 has long been rumoured. Not least because its predecessor, the Oura Ring Gen 3, has been out for years. It seemed the company wasn’t in a rush to update its ...

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 ...

See our ethics statement. For the greater part of this past summer, I wore six smart rings at once. I wanted to see which was best, and the Oura Ring Gen 3 was the clear winner. Well, it’s been ...

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 ...

The Oura Ring 4 is hands-down the greatest smart ring for fitness tracking that money can buy. Between the comfortable fit, discreet functionality, nearly a week of battery life and a ...

Please verify your email address. The Oura Ring 4 is the kind of iterative hardware update I like to see. For the same $349 starting price as the Gen 3 Horizon, Oura's latest smart ring is a bit ...

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 ...