In order for Peter to be watching, in the ordinary meaning of the word, he must have the ability to see.

In order for Peter to be watching, in the ordinary meaning of the word, he must have the ability to see. Something must also be the cause of the projection, whether projected on the wall or TV Statement (13) is also . an obviously entailed statement, but in a different sense. As it necessarily follows from (10) with the addition that A Field of Dreams is a movie, it is not part of the functionally minimized set of necessary and sufficient conditions, but should be included because obvious entailment includes all necessary statements. Why, or how, are statements such as (9), (11) and (12) obviously entailed?

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