Encyclopedia > 4200 BC

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5th millennium BC

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(6th millennium BC - 5th millennium BC - 4th millennium BC or 40th century BC - other millennia)


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Inventions, Discoveries, Introductions



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Quadratic formula

... touches the x-axis in a single point.) If the discriminant is positive, then there are two different solutions x, both of which are real. (Geometrically, this means ...

 
 
 
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