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Example 2.7
ОглавлениеTo use the Euler–Poincare law to justify the validity of generic objects in the first column of Table 2.9.
Table 2.9 Examples of generic objects.
| Example | F | E | V | L | B | G | F − E + V − L = 2(B − G) |
| 13 | 27 | 18 | 2 | 1 | 0 | 13 − 27 + 18 − 2 ≡ 2(1 − 0) | |
| 10 | 24 | 16 | 2 | 1 | 1 | 10 − 24 + 16 − 2 ≡ 2(1 − 1) | |
| 7 | 13 | 10 | 0 | 2 | 0 | 7 − 13 + 10 − 0 ≡ 2(2 − 0) | |
| 12 | 24 | 16 | 0 | 2 | 0 | 12 − 24 + 16 − 0 ≡ 2(2 − 0) |
