Every whale is a mammal.
Any whale is a mammal.
Whales are mammals.
If anything is a whale, it is amammal.
Anything that is a whale is a mammal.
If anything is not a mammal, itis not a whale.
All non-mammals are non-whales.
A thing is a whale only if it isa mammal.
Only mammals are whales.
Nothing is a whale unless it isa mammal.
No whale is not a mammal.
NOTE: Seeing Minke whales swimming in the opensea quite close to our boat in Kennebunkport last summer was one of the highlights ofthe year. We had seen whales before inCabo San Lucas, but only from the shore at a great distance. I would love to have also posted a link to Claire Hamill’s song You Take My BreathAway, but couldn’t find the original version from her Stage Door Johnnies record. Eva Cassidy had greatsuccess with her version, but Claire’s is really unforgettable. The "equivalents" list is excerpted from Logic by Wesley Salmon (Prentice-Hall, 1973).
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