| English thesaurus | |||
| |||
| Heaviside function (ssn) | |||
|
threshold : 139 phrases in 30 subjects |
| Acoustics | 2 |
| Analytical chemistry | 2 |
| Antennas and waveguides | 4 |
| Chemistry | 2 |
| Commerce | 1 |
| Construction | 10 |
| Ecology | 2 |
| Economics | 4 |
| Electronics | 15 |
| Finances | 12 |
| General | 6 |
| Health care | 4 |
| Isolation | 8 |
| Law | 1 |
| Lighting other than cinema | 5 |
| Magnetics | 2 |
| Mathematics | 2 |
| Mechanics | 1 |
| Medical | 4 |
| Microsoft | 12 |
| Nuclear physics | 2 |
| Politics | 3 |
| Radio | 5 |
| Radiobiology | 17 |
| Radiology | 2 |
| Risk Management | 1 |
| Semiconductors | 1 |
| Social science | 1 |
| Transport | 1 |
| Vacuum tubes | 7 |