Context: Comparison of a back-translation with the original text is sometimes used as a check on the accuracy of the original translation, much as the accuracy of a mathematical operation is sometimes checked by reversing the operation. But the results of such reverse-translation operations, while useful as approximate checks, are not always precisely reliable. Back-translation must in general be less accurate than back-calculation because linguistic symbols (words) are often ambiguous, whereas mathematical symbols are intentionally unequivocal.

Question: What is sometimes used to check the accuracy of a translation?
Answer: Comparison of a back-translation with the original text

Question: How are mathematical operations checked?
Answer: by reversing the operation

Question: What operations are results from not always completely reliable?
Answer: reverse-translation operations

Question: What symbol set has a defining property of ambiguity?
Answer: linguistic

Question: What symbol set has the property of being intentionally unequivocal?
Answer: mathematical

Question: What is no longer used to check the accuracy of a translation?
Answer: Unanswerable

Question: How are mathematical operations ignored?
Answer: Unanswerable

Question: What operations are always reliable?
Answer: Unanswerable

Question: What symbol set has no defining property of ambiguity?
Answer: Unanswerable

Question: What symbol set has the property of being unintentionally unequivocal?
Answer: Unanswerable