Table 3
| 1 | 2 | 1 and 2 = 5 |
| T | T | T |
| F | T | F |
| T | F | F |
| F | F | F |
“and” and the other words and phrases joining together the original two statements to make new statements are called connectives, or logical connectives. The connectives that we have illustrated in statements 7 to 10 are: or, if ··· then, if and only if, or else.
Table 4 shows the truth table that applies to statements 7, 8, 9, and 10. This truth table expresses the calculation of the logical truth or falsity of these statements.