Zénodore (mathematician)

Zénodore (Latin: Zenodorus ) (Greece, second half of the {{IIe}} century before J.C.) is a Mathématicien and Greek Astronome whose life is little known, but whose work is known via quotations.

Work

Zénodore studied the determination of the surface of a geometrical figure and that of the volume of an object with a given surface. Its treaty On the isomorphous figures relates to the geometry and two and three dimensions.

Proof S which is allotted to him:

a regular Polygon at more large surface among the Polygon S of the same Perimeter and of the same number on sides.
the Cercle has a surface upper than that of any of the same polygon perimeter. For this, it made use of a result of Archimedes which determines that the surface of a circle is equal to the surface of a right-angled Triangle of which the opposite side (C. - with-D. the perpendicular side) has a length equal to the ray of the circle and of which the adjacent side (C. - with-D. the other side put aside the Hypoténuse) has a length equal to the Circonférence of the circle.
the Sphère is the solid which on the smallest surface for a given volume.

Quotations

An Arab translation of the work Of the extreme mirrors of Dioclès in fact mention: Zénodore would have been in Arcadie and would have pushed mathematicians to be determined how to place mirrors so that they concentrate solar light, lighting a fire.

Before one finds extreme mirrors , the existence of Zénodore was known only by quotations with its treaty On the isomorphous figures , which remains lost. Several of its results are quoted by Théon of Alexandria in its comment on the Almageste of Ptolémée. Work of Pappus makes also use of the treaty of Zénodore and the comparison with the writings of Théon reveals that Pappus had to follow work of Zénodore of very near.

Another source

Another source mentions Zénodore, the biography of Philonides, found with Herculanum, preserved under the remainders of the historical eruption of August 79 of the Vesuvius. The reference to certain Zénodore probably corresponds to this mathematician. He would have been the friend of Philonides and its biography mentions two visits of that one with Athens.

Random links: