3 giorni fa · History Parabolic compass designed by Leonardo da Vinci The earliest known work on conic sections was by Menaechmus in the 4th century BC. He discovered a way to solve the problem of doubling the cube using parabolas. (The solution, however, does not meet the requirements of compass-and-straightedge construction.) The area enclosed by a

**parabola**and a line segment, the so-called "**parabola**...3 giorni fa · In fact, the example of complex numbers is essentially the same as (that is, it is isomorphic to) the

**vector space**of ordered pairs of real numbers mentioned above: if we think of the complex number x + i y as representing the ordered pair (**x, y**) in the complex plane then we see that the rules for addition and scalar multiplication correspond exactly to those in the earlier example.