I regard it as an inelegance, or imperfection, in quaternions, or rather in the state to which it has been hitherto unfolded, whenever it becomes or seems to become necessary to have recourse to x, y, z, etc..
William Rowan Hamilton (1805 - 1865)
Source: a letter from Tait to Cayley.
Contributed by: Zaady
Who would not rather have the fame of Archimedes than that of his conqueror Marcellus?
Source: H. Eves Mathematical Circles Revisited, Boston: Prindle, Weber and Schmidt, 1971.
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