## `universe` -- the set-theoretical universe

#### Introduction

`universe` represents the set-theoretical universe of all objects.

#### Related Functions

`_union`, `_intersect`, `_minus`, `DOM_SET`

#### Details

- `universe` is the only element of the domain `stdlib::Universe`.
- The standard set operations such as union, intersection and subtraction can be used with `universe`.

#### Example 1

We show some basic set operations involving `universe`:

    >> universe union {a}

                                     universe

    >> universe intersect {a}

                                        {a}

    >> {a} minus universe

                                        {}

#### Changes

- `universe` is a new object.

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