Lord Kelvin Quotes on Mathematics
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Quaternions came from Hamilton after his really good work had been done, and though beautifully ingenious, have been an unmixed evil to those who have touched them in any way.
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Symmetrical equations are good in their place, but 'vector' is a useless survival, or offshoot from quaternions, and has never been of the slightest use to any creature.
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Do not imagine that mathematics is hard and crabbed, and repulsive to common sense. It is merely the etherealization of common sense.