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name with a uppercase letterbracesfor example, E = {2,4,6,8}You can also draw an oval with the numbers inside it, and the set name [E] next to the oval.
The real number system can be illustrated by a Venn diagram, which looks like a number of circles or ovals which intersect or are nested. It's not possible to draw such a diagram in the WikiAnswers browser, but the following might dive the flavor: Draw a large oval which represents the integers. Inside it, draw a smaller oval to represent the whole numbers. The space between these ovals contains the negative integers. Inside the small oval draw a circle and write in it "natural numbers". Just outside the circle write a "0".
An ellipse always has two axes of reflection; an oval has one or more.So, an egg-shape is an oval, but not an ellipse.In short an ellipse is an oval, but an oval may or may not be an ellipse.
True oval have no sharp corners