Casual Introduction (concl.)

Table 5 exhibits the rules of inference responsible for giving the differential proposition its meaning in practice.

If the feature is interpreted as applying to an object in the universe of discourse then the differential feature may be taken as an attribute of the same object which tells it is changing significantly with respect to the property — as if the object bore an “escape velocity” with respect to the condition

For example, relative to a frame of observation to be made more explicit later on, if and are true at a given moment, it would be reasonable to assume will be true in the next moment of observation.  Taken all together we have the fourfold scheme of inference shown above.

Resources

• Logic Syllabus
• Survey of Differential Logic

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