| 1 | We have seen differentials. | |
| 2 | Just in the language of differentials. The example that I promised. | |
| 3 | Now we can use it to derive differential relations for all of the thermodynamics quantities. | |
| 4 | This is a sophisticated differential signaling system that we haven' t previously known about. | |
| 5 | The other sensors will be based on 'differential mobility analysis' and infrared detection. |