Columbia City, Indiana. Columbia City is a city in Columbia Township, Whitley County, in the U.S. state of Indiana. The population was 8,750 at the 2010 census. The city is the county seat of Whitley County.
Hence, hex digits are 0,1,2,3,4,5,6,7,8 and 9 A, B, C, D, E, F. This number system is the most commonly used in mathematics and information technologies. I.e. in html programming colors can be represented by a 6-digit hexadecimal number: FFFFFF represents white, 000000 represents black, and so on.
Euler's formula for force It's erroneous to attribute $F=ma$ to Euler. Even though Newton never wrote $F=ma$ in his Principia, this statement is almost universally recognized as Newton's second law. As far as I can tell, it was Jakob Hermann who first expressed Newton's words in an algebraic statement akin to $F=ma$.