Some puzzles appear impossible to solve. They can only be solved by
considering more possibilities than it seems reasonable to consider. The more
puzzling the puzzle, the more outlandish those possibilities might have to be.
And a very puzzling puzzle was discovered by a mathematician at the end of the
nineteenth century:
Its solution is only a logical possibility if there is a God.
Bertrand Russell was thinking about that
puzzle when he found another puzzle, which he tried to solve by making logic
more mathematical. And logicians have carried on finding puzzles and modernizing
logic. Modern logic now looks very scientific. But when scientists discover
something outlandish by thinking logically, do they change the meaning of the
word logic? Or do they revise their worldviews?
That nineteenth-century puzzle amounts to
a scientific proof that there is, in all probability, a God:
Chapter 1
explains how that is possible.
Chapter 2 runs
through the mathematics.
Chapter 3 shows the probability to be high.
Chapter 4
solves the other puzzles.
That is the preface to my 10,705-word book: If (updated 23 November)


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