Table 3 Properties of upper approximation operations
| Â | \(\overline{C}_{61}\) | \(\overline{C}_{64}\) | \(\overline{C}_{65}\) | \(\overline{C}_{71}\) | \( \overline{C}_{74}\) | \(\overline{C}_{75}\) | \(\overline{C}_{81}\) | \(\overline{C}_{84}\) | \( \overline{C}_{85}\) | \(\overline{C}_{101}\) | \(\overline{C}_{105}\) | Â |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
1H | \(\checkmark \) | \(\checkmark \) | \(\checkmark \) | \(\checkmark \) | \(\checkmark \) | \(\checkmark \) | \(\checkmark \) | \(\checkmark \) | \(\checkmark \) | \(\checkmark \) | \(\checkmark \) | \(\checkmark \) |
2H | \(\checkmark \) | \(\checkmark \) | \(\checkmark \) | \(\checkmark \) | \(\checkmark \) | \(\checkmark \) | \(\checkmark \) | \(\checkmark \) | \(\checkmark \) | \(\checkmark \) | \(\checkmark \) | \(\checkmark \) |
3H | \(\checkmark \) | \(\checkmark \) | \(\checkmark \) | \(\checkmark \) | \(\checkmark \) | \(\checkmark \) | \(\checkmark \) | \(\checkmark \) | \(\checkmark \) | \(\checkmark \) | \(\checkmark \) | \(\checkmark \) |
4H | – | – | \(\checkmark \) | – | – | – | \(\checkmark \) | \(\checkmark \) | \(\checkmark \) | \(\checkmark \) | – | \(\checkmark \) |
5H | \(\checkmark \) | \(\checkmark \) | \(\checkmark \) | – | – | \(\checkmark \) | – | – | \(\checkmark \) | – | – | \(\checkmark \) |
6H | – | – | \(\checkmark \) | – | – | – | \(\checkmark \) | \(\checkmark \) | \(\checkmark \) | \(\checkmark \) | - | \(\checkmark \) |
7H | – | – | – | – | – | \(\checkmark \) | – | – | – | – | – | – |