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Galilean moon

The Galilean moons are the moons of Jupiter discovered by Galileo Galilei (because they were visible with the low-power telescope he invented). They were first observed by Galileo on January 7, 1610. In order from closest to Jupiter to farthest away, they are:



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Quadratic formula

... is not 2. (In a field of characteristic 2, the element 2a is zero and it is impossible to divide by it.) The symbol <math>\pm \sqr ...

 
 
 
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