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A number line is usually represented as being horizontal, but in a Cartesian coordinate plane the vertical axis (y-axis) is also a number line. [5] The arrow on the line indicates the positive direction in which numbers increase. [5] Some textbooks attach an arrow to both sides, suggesting that the arrow indicates continuation.
Graph paper has horizontal and vertical lines evenly spaced over the entire page to create a grid of squares and is used for drafting, drawing and plotting graphs. Often every tenth or fifth line is bolded to assist in counting the lines when plotting data. Quadrille ruled paper (or quad paper) is similar to graph paper but without the bolded ...
A point on number line corresponds to a real number and vice versa. [15] Usually, integers are evenly spaced on the line, with positive numbers are on the right, negative numbers on the left. As an extension to the concept, an imaginary line representing imaginary numbers can be drawn perpendicular to the number line at zero. [16]
The vinculum, in its general use, was introduced by Frans van Schooten in 1646 as he edited the works of François Viète (who had himself not used this notation). However, earlier versions, such as using an underline as Chuquet did in 1484, or in limited form as Descartes did in 1637, using it only in relation to the radical sign, were common.
When this is written using the symmetrical ratio notation, a horizontal line has slope : and a vertical line has slope : However, if the slope is taken to be a single real number then a horizontal line has slope 0 1 = 0 {\displaystyle {\tfrac {0}{1}}=0} while a vertical line has an undefined slope, since in real-number arithmetic the quotient 1 ...
Knuckle mnemonic for the number of days in each month of the Gregorian calendar.Each knuckle represents a 31-day month. A mnemonic device (/ n ə ˈ m ɒ n ɪ k / nə-MON-ik) [1] or memory device is any learning technique that aids information retention or retrieval in the human memory, often by associating the information with something that is easier to remember.
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