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An overline, overscore, or overbar, is a typographical feature of a horizontal line drawn immediately above the text. In old mathematical notation , an overline was called a vinculum , a notation for grouping symbols which is expressed in modern notation by parentheses, though it persists for symbols under a radical sign.
A longer horizontal stroke at the top or bottom, as in E T, is an arm. [4] The junction of two strokes intersecting above as in A M X x is an apex and the joining of two strokes intersecting below as in V W v w is a vertex. [10] The font shown in the example is stressed; this means that strokes have varying widths. In this example, the stroke ...
The principal line terms in typography. For broader context, see Typeface anatomy. In European and West Asian typography and penmanship, the baseline is the line upon which most letters sit and below which descenders extend. [1] In the example to the right, the letter 'p' has a descender; the other letters sit on the (red) baseline.
Historically, upper-case letters were used for representing points in geometry, and lower-case letters were used for variables and constants. Letters are used for representing many other sorts of mathematical objects. As the number of these sorts has remarkably increased in modern mathematics, the Greek alphabet and some Hebrew letters are also ...
Every point on the line has a real-number coordinate, and every real number represents some point on the line. There are two degrees of freedom in the choice of Cartesian coordinate system for a line, which can be specified by choosing two distinct points along the line and assigning them to two distinct real numbers (most
0 reserved code points: Unicode version history; 1.0.0 (1991) 79 (+79) ... SQUARE WITH UPPER LEFT TO LOWER RIGHT FILL ... WHITE SQUARE WITH VERTICAL BISECTING LINE:
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The image on the right shows a function that is not lower hemicontinuous at x. To see this, let a be a sequence that converges to x from the left. The image of x is a vertical line that contains some point (x,y). But every sequence b that corresponds to a is contained in the bottom horizontal line, so it cannot converge to y. In contrast, the ...