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A line can be described like ideal zero-width, infinitely long, perfectly straight curve (the curve of term in the mathematics includes "the straight curves") that it contains a number of points infinitely. In Euclidean geometry, a line can be found exactly that it crosses all the two points. The line supplies the shorter connection between the points. In two dimensions, two different lines can be parallels, never meaning they do not come to contact of, or they can intersect to and only a point. In the three or more dimensions, lines can also oblique being, meaning do not come to contact, but moreover they do not define of an airplane. Two distinguished airplane intersect within tutt' to more one line. The three or more points that are found on the same line are call to you collinear. This intuitivo concept of a line can be formalized in several senses. If geometry is developed axiomatically (like in the elements of the Euclid and more subsequently in the foundations of David Hilbert of geometry), then the lines they are defined at all, but they are characterized axiomatically from their property. While Euclid has defined a line like "length without width", it has not used this rather dark definition in its successive development. More abstractly, the prototype of a line is believed usually next to the real line as and supposes that the points on one line levino in feet in one value correspondence univoco with the real numbers. However, one has been able also to use the numbers hyperreal to this fine, or even the long line of topology. In Euclidean geometry, a beam, or the half-linens, data two heads distinguished For (the origin) and the B on the beam, is with of i points C on the line that contains the such points To and B that is not rigorously between the C and the B. In geometry, a beam begins to a point, then ignites in order always in a sense.