![]() Is your blue the same as my blue? Probably, but it may not be the same as Newton's. For example, Newton's indigo is the modern blue, while his blue corresponds to the color we refer to as cyan. In fact, there is evidence Newton's division of the spectrum doesn't even correspond to the colors we define by wavelengths. Any given beam of light has specific values of. It can be thought of as a stream of minute energy packets radiated at varying frequencies in a wave motion. As a form of electromagnetic radiation, light has properties in common with both waves and particles. To understand colour, therefore, it is necessary to know something about light. The modern spectrum typically omits indigo. Newton demonstrated that colour is a quality of light. So, the spectrum was first described with seven colors, but most people, even if they see color well, can't actually distinguish indigo from blue or violet. English mathematician Isaac Newton (1643–1727) coined the word spectrum (Latin for "appearance") in his 1671 book "Opticks." He divided the spectrum into seven sections-red, orange, yellow, green, blue, indigo, and violet-in keeping with the Greek sophists, to connect the colors to days of the week, musical notes, and the known objects of the solar system. Here, we study a new variant of Graph Coloring, called Colorful Graph Coloring (CGC), which given a simple graph G and a positive integer d, asks for the minimum number of colors needed to color the coloring elements of G, such that for every colorful element of G, the coloring elements in its neighborhood have at least d colors. If you want a number, it's around 445 nanometers, but it doesn't appear on most spectra. ![]() There is no wavelength assigned to indigo. ![]()
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