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When its gone, you'll know what a gift love was. you'll suffer like this. So go back and fight to keep it.

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Keith Devlin

The human brain finds it extremely hard to cope with a new level of abstraction. This is why it was well into the eighteenth century before mathematicians felt comfortable dealing with zero and with negative numbers, and why even today many people cannot accept the square root of minus-one as a genuine number.

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