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In article <AOidnRXEZpU99WvZnZ2dnUVZ_vydnZ2d@xxxxxxxxxxx>,
"Your Logic Tutor" <ylt...@xxxxxxxxxx> wrote:
> "Sean" <relaxing@earth> wrote
>
> > I don;t agree with princeton
>
> Try Copi's textbook, _Introduction to Logic_
>
> <quote>
> Famous in the history of science is the argument _ad ignorantiam_ given in
> criticism of Galileo, when he showed leading astronomers of his time the
> mountains and valleys on the moon that could be seen through his telescope.
> Some scholars of that age, absolutely convinced that the moon was a perfect
> sphere, as theology and Aristotelian science had long taught, argued against
> Galileo that, although we see what appear to be mountains and valleys, the
> moon is in fact a perfect sphere, because all its apparent irregularities
> are filled in by an invisible crystalline substance.
Note that there is a difference between the astronomers' "is in fact"
argument and anything less certain, which makes anything less certain
NOT an argumentum ad ignorantiam.
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