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Lewis Carroll the writer of "Through the Looking Glass & what Alice found there" didn't just do fiction; this book on Logic was way ahead of its time.
I'm enjoying the read , but can't get past a book on logic being digitized by Google , having a typo on pg. 28 .
The typo is written: Similarly we may represent the three similar Propositions " Some x are y' ", " Some x' are y " , and " Some x are y' " <<< this last example should read: " Some x' are y' " .