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en.wikipedia.org/wiki/Horizontal_line_test

In mathematics, the horizontal line test is a test used to determine whether a function is injective ... (because they lie on the line y = c {\displaystyle y=c} y=c ) but different x values, which by definition means the function cannot be injective.

en.wikipedia.org/wiki/Horizontal_and_vertical

The usage of the inter-related terms horizontal and vertical as well as their symmetries and ... Girard Desargues defined the vertical to be perpendicular to the horizon in his Perspective of ... A horizontal line is any line normal to a vertical line.

www.mathopenref.com/horizontal.html

In geometry, a horizontal line is one which runs from left to right across the page. It comes from the word 'horizon', in the sense that horizontal lines are parallel to ...

www.mathopenref.com/coordhorizontal.html

Definiton and equation for a horizontal line in coordinate geometry.

www.investopedia.com/terms/h/horizontal-line.asp

DEFINITION of 'Horizontal Line'. In finance and economics, a horizontal line is usually the X axis in a data plot. It is a line that appears to proceed from left to right ...

virtualnerd.com/algebra-1/linear-equation-analysis/intercept/horizontal-vertical-lines/horizontal-line-definition

It's a horizontal line! And just like the horizon, horizontal lines go straight left and right. ... definition; horizontal; graph; graphical; equation; horizontal; flat ...