Line 222: |
Line 222: |
| | | |
| <pre> | | <pre> |
− | p o--o q | + | a o--o b |
| | | | | |
− | o--o p | + | o--o a |
| | | | | |
− | o--o p | + | o--o a |
| | | | | |
| @ = @ | | @ = @ |
Line 234: |
Line 234: |
| | | |
| <pre> | | <pre> |
− | p o--o q | + | a o--o b |
| | | | | |
− | o--o p | + | o--o a |
− | | p | + | | a |
| @ = @ | | @ = @ |
| </pre> | | </pre> |
| + | |
| + | Compare with: |
| + | |
| + | <pre> |
| + | a o b |
| + | | |
| + | o--o a |
| + | | a |
| + | @ = @ |
| + | </pre> |
| + | |
| + | That is: |
| + | |
| + | <pre> |
| + | ab a |
| + | o o |
| + | \ / |
| + | o |
| + | | a |
| + | @ = @ |
| + | </pre> |
| + | |
| + | In other words, <math>(a \land b) \lor a \iff a</math> |