In a letter to Philip Jourdain, c. 1914, Frege illustrates
his distinction between sense and reference by the example
of an explorer who encounters the same mountain from
different directions. The explorer does not know that
it is the same mountain, since it differs greatly from
the two aspects; and he therefore refers to it with
two different names, 'Aphla' and 'Ateb'. According to
Frege, the names share the same reference, but differ
in their sense.
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