Abstract
A reference axis in a two-dimensional rectangular Cartesian coordinate system; by convention, the horizontal axis (x-axis) of a bivariate (x, y) scatterplot. This terminology was used by, and may have been introduced by, the British mathematician, (Sir) James Ivory (1765–1842) (Ivory 1809; Miller 2015a).
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Bibliography
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IVORY, J. (1809). On the attractions of homogeneous ellipsoids. Philosophical Transactions of the Royal Society, London, 99, 345–372.
KRUMBEIN, W.C. and PETTIJOHN, F.J. (1938). Manual of sedimentary petrography.. New York, NY, NY, Appleton-Century.
MILLER, J. (ed.) (2015a). Earliest known uses of some of the words of mathematics [online: http://jeff560.tripod.com/mathword.html].
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Howarth, R.J. (2017). X. In: Dictionary of Mathematical Geosciences . Springer, Cham. https://doi.org/10.1007/978-3-319-57315-1_24
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DOI: https://doi.org/10.1007/978-3-319-57315-1_24
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