Euclid Flashcards
Widely thought to be the first systematizer of geometry
Euclid
comprehensive system that wove the various bits of knowledge together into a single framework
Euclidean Geometry
From 5 postulates (axioms), one can derive all the known geometrical propositions using deductive logic alone (He axiomatized geometry)
Euclidean Geometry (2)
to draw a straight line from any point to any point
Postulate (1)
to produce a finite straight line continuously in a straight line
Postulate (2)
to describe a circle with any center and radius
Postulate (3)
that, if a straight line falling on two straight lines makes the interior angles on the side less than two right angles, the two straight lines, if produced indefinitely, meet on that side on which are the angles less than the two right angles
Postulate (4)
basic postulates are seemingly trivial and impossible to deny is pretty much the point; the system is complete, simple, and certain
Geometry
Is this theory logically consistent? Does it accurately describe the world?
Two Questions about Euclid Geometry
Attempted to show Euclid’s theory couldn’t serve as a model of space for it entails absurdities
Zeno
No length can be crossed in a finite time
Motion is Impossible!
There is a difference between having in infinite number of parts and being infinitely large
Aristotle
1/2, 1/2 + 1/4, 1/2 + 1/4, 1/8
The Zeno Sequence
a series in which there is a constant ration between any two successive terms
A Geometric Series
the sum of an infinite sequence is the limit of the sequence of terms; if there is one
Converging Series