Positive set theory

To understand positive set theory, you need to know what a "set" is first. A set is a group of things that belong together. For example, a set of animals might include dogs, cats, and birds.

Positive set theory is a way of looking at sets where we only focus on what's in the set and not what's not in the set. We call this "positive" because we're only looking at the positive aspects of the set.

For example, let's say we have a set of fruits that includes apples, bananas, and oranges. In positive set theory, we only care about what fruits are in the set. We don't care about any other fruits that aren't in the set. So, we can say that the positive aspect of this set is that it includes apples, bananas, and oranges.

Positive set theory is important because it helps us understand sets better. It allows us to focus on what's important about a set and ignore everything else. This makes it easier to work with sets and use them to solve problems.

In summary, positive set theory is a way of looking at sets where we only focus on what's in the set and not what's not in the set. We call it "positive" because we're only looking at the positive aspects of the set. It helps us understand sets better and makes it easier to work with them.