In mathematics, infinity is the conceptual expression of such a numberless number. It is often symbolized by the lemniscate (also known as the lemniscate of Bernoulli), which looks something like the numeral 8 written sideways (). This symbol for infinity was first used in the 1600s by the mathematician John Wallis.
An epic is a poem; most epics started as oral tales that were passed down from generation to generation (often in the form of songs), which is why they're poems. A legend and a myth are more similar, but a myth most often explains something about the universe. So while there might be a legend about a man who slayed all the dragons, a myth would be about the man who caused it to rain, or how humans were created. Those are the basics differences.
The Great Epic. According to most dictionaries, an epic is an extended narrative poem in elevated or dignified language, celebrating the feats of a legendary or traditional hero. While this is true, the epic Beowulf contains more than those two requirements. This story contains five elements which make it an epic. There is an epic hero, action of an immense scale, an elevated writing style, long speeches meant to inspire or instruct, and also the descent into the underworld. An epic hero is a main character who embodies the ideals of a certain culture.