## Set Operators

The following operators take sets as operands. Set Operators

Operator |
Operation |
Operand Types |
Result Type |
Example |

+ |
union |
set |
set |
Seti + Set2 |

- |
difference |
set |
set |
S - T |

* |
intersection |
set |
set |
S * T |

<= |
subset |
set |
Boolean |
Q <= MySet |

>= |
superset |
set |
Boolean |
Si >= S2 |

= |
equality |
set |
Boolean |
S2 = MySet |

<> |
inequality |
set |
Boolean |
MySet <> Si |

in |
membership ordinal, set |
Boolean |
A in Seti |

### The following rules apply to +, -, and *.

- An ordinal o is in X + y if and only if o is in X or y (or both). o is in X - y if and only if o is in X but not in y. o is in X * y if and only if o is in both X and y.
- The result of a +, -, or * operation is of the type set of a..b, where a is the smallest ordinal value in the result set and B is the largest.

### The following rules apply to <=, >=, =, <>, and in.

- X <= y is True just in case every member of X is a member of y; z >= w is equivalent to w <= z. u = V is True just in case u and V contain exactly the same members; otherwise, u <> V is True.
- For an ordinal o and a set s, o in s is True just in case o is a member of s.

## Project Management Made Easy

What you need to know aboutâ€¦ Project Management Made Easy! Project management consists of more than just a large building project and can encompass small projects as well. No matter what the size of your project, you need to have some sort of project management. How you manage your project has everything to do with its outcome.

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