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ideal element

British  

noun

  1. any element added to a mathematical theory in order to eliminate special cases. The ideal element i = √–1 allows all algebraic equations to be solved and the point at infinity ( ideal point ) ensures that any two lines in projective geometry intersect

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

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As the lightest metal on the periodic table, and the one most eager to shed its electrons, lithium is the ideal element to make powerful, portable batteries.

From Nature ● Oct. 27, 2015

It is on the latter or ideal element that Kant makes the emphasis increasingly turn.

From Hegel's Philosophy of Mind by Georg Wilhelm Friedrich Hegel

The idealisation of science is simply a further development of this ideal element.

From John Dewey's logical theory by Delton Thomas Howard

And yet how perfectly did his genius divine that ideal element in our early New England life, conceiving what must have been without asking proof of what actually was!

From Among My Books First Series by James Russell Lowell

But the moment it is admitted that there is a beauty of form independent of the ideal element, this theory can no longer stand.

From The Psychology of Beauty by Ethel Dench Puffer Howes

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