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  2. Horizontal line test - Wikipedia

    en.wikipedia.org/wiki/Horizontal_line_test

    A horizontal line is a straight, flat line that goes from left to right. Given a function f : R → R {\displaystyle f\colon \mathbb {R} \to \mathbb {R} } (i.e. from the real numbers to the real numbers), we can decide if it is injective by looking at horizontal lines that intersect the function's graph .

  3. Injective function - Wikipedia

    en.wikipedia.org/wiki/Injective_function

    A graphical approach for a real-valued function of a real variable is the horizontal line test. If every horizontal line intersects the curve of f ( x ) {\displaystyle f(x)} in at most one point, then f {\displaystyle f} is injective or one-to-one.

  4. Talk:Horizontal line test - Wikipedia

    en.wikipedia.org/wiki/Talk:Horizontal_line_test

    The term "horizontal line test" is sometimes used in calculus (it is the same idea as Vertical line test).However, this article is written in very general terms and is claimed to be part of set theory, which doesn't make any sense to me, because the bit about graphs and horizontal lines seems to require a real-valued function of a real variable.

  5. Distance from a point to a line - Wikipedia

    en.wikipedia.org/.../Distance_from_a_point_to_a_line

    Horizontal and vertical lines. In the general equation of a line, ax + by + c = 0, a and b cannot both be zero unless c is also zero, in which case the equation does not define a line. If a = 0 and b ≠ 0, the line is horizontal and has equation y = -c/b.

  6. Glossary of mathematical symbols - Wikipedia

    en.wikipedia.org/wiki/Glossary_of_mathematical...

    Often replaced by a horizontal bar. For example, 3 / 2 or . 2. Denotes a quotient structure. For example, quotient set, quotient group, quotient category, etc. 3. In number theory and field theory, / denotes a field extension, where F is an extension field of the field E. 4.

  7. What Is the 'Green Line Test,' Exactly? What To Know About ...

    www.aol.com/lifestyle/green-line-test-exactly...

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  8. Vertical and horizontal - Wikipedia

    en.wikipedia.org/wiki/Vertical_and_horizontal

    The word horizontal is derived from the Latin horizon, which derives from the Greek ὁρῐ́ζων, meaning 'separating' or 'marking a boundary'. [2] The word vertical is derived from the late Latin verticalis, which is from the same root as vertex, meaning 'highest point' or more literally the 'turning point' such as in a whirlpool.

  9. Line–line intersection - Wikipedia

    en.wikipedia.org/wiki/Lineline_intersection

    Two intersecting lines. In Euclidean geometry, the intersection of a line and a line can be the empty set, a point, or another line.Distinguishing these cases and finding the intersection have uses, for example, in computer graphics, motion planning, and collision detection.