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The Navier–Stokes equations (/ n æ v ˈ j eɪ s t oʊ k s / nav-YAY STOHKS) are partial differential equations which describe the motion of viscous fluid substances. They were named after French engineer and physicist Claude-Louis Navier and the Irish physicist and mathematician George Gabriel Stokes.
Tam thiên tự (chữ Hán: 三千字; literally 'three thousand characters') is a Vietnamese text that was used in the past to teach young children Chinese characters and chữ Nôm. [ 1 ] [ 2 ] It was written around the 19th century. [ 3 ]