Question

Is phi a subset of {1, 2, 3, 4, 5, 6} ?

Answer 1

define what phi is in this context?

Answer 2

Model 4:The Empty Set and the Null Set:
The empty set or null set is a set that has no elements.

The empty set is represented as { }, and the null set is represented as . is the letter phi (pronounced "fie," rhymes with "pie") from the Greek alphabet.

Remember, the empty set is a subset of any set.
Weiss points out a difference between the null and empty sets. Even these sets, {} {0}, have elements in them, but the empty set, { }, has no element. We will follow Weiss and describe the empty set as a finite set.

The symbol means "is an element of."
5 B means that 5 is an element of the set B = {4, 5, 6}.
In this example, 7 B means that 7 is not an element of the set B.


This is all the lesson states about it.