On the other hand, the set of animals that are both duck-billed and are mammals is the set:

"**A** and **B**,"

written:

\[ A \cap B,\]

and called the **conjuction** of **A** and **B**.

Note that the set \( A \cap B\) contains only platypuses.

Monday, 17 March 2014 23:36
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Disjunction and Conjunction

By
Gideon

Now suppose we consider only animals that are either duck-billed, or are mammals.

This is the set "**A** or **B**," the disjunction of **A** and **B**, written as:

\[ A \cup B,\]

and illustrated in the following diagram:

This set, \( A \cup B,\) contains ducklings, and rabbits, and platypuses.

On the other hand, the set of animals that are both duck-billed and are mammals is the set:

"**A** and **B**,"

written:

\[ A \cap B,\]

and called the **conjuction** of **A** and **B**.

Note that the set \( A \cap B\) contains only platypuses.

Published in
Boolean Algebra

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