vacuously
Adverb
Meaning
in a vacuous manner
Source: WordNetSynonyms
Antonyms
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In this case, the statement "all cell phones in the room are turned on" would also be vacuously true, as would the conjunction of the two: "all cell phones in the room are turned on and turned off".
Note that the empty set is a subset of every set (the statement that all elements of the empty set are also members of any set A is vacuously true ).
Outside of mathematics, statements which can be characterized informally as vacuously true can be misleading.
Proof: If there is no possible move, then the lemma is vacuously true (and the first player loses the normal play game by definition).