Typesetting "errors" in which exponents or multiplication signs are omitted but the resulting expression is equivalent to the original one. Examples include
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(1)
|
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(2)
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(3)
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and
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(4)
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where a whole number followed by a fraction is interpreted as a mixed fraction (e.g., 
).
D. Wilson computed all possible errors obtained by dropping exponents in a product
for bases 2 to 15 and numbers 
:
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(5)
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(6)
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(7)
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Wilson also gave the numbers 
and 
, where the two digit base-
satisfies
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(8)
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and for which there exist an infinite number of examples.
