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| Betti number; connectivity number | |||
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| connectivity number | |||
| 连通数: 18 phrases in 12 subjects |
| Artificial intelligence | 2 |
| Automobiles | 1 |
| Aviation | 1 |
| Electronics | 1 |
| Metallurgy | 1 |
| Mining | 2 |
| Nautical | 2 |
| Oil / petroleum | 3 |
| Project management | 1 |
| Technology | 2 |
| Telecommunications | 1 |
| Wind Energy | 1 |
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