In this document, it says:
An LTI (Linear, Time-Invariant) system, in a simplified sense, will exhibit two behaviors
Can someone explain why the use of "An" instead "a" is correct here?
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Fowler says that it's a question of pronunciation. "Before letters standing for abbreviations or symbols the choice is usually determined by the sound of the letter, e.g. an R.A., an M. P." And I like how Fowler ends this line of thought: ". . . but that is the sort of thing about which we ought to be allowed to do as we please, so long as we are consistent." (H.W. Fowler, "A Dictionary of Modern English Usage," second edition, Oxford, 1965.)