Although abbreviations are sometimes useful for long, technical terms in scientific writing, communication is usually garbled rather than clarified if, for example, an abbreviation is unfamiliar to the reader.
Some abbreviations may not be in the dictionary but appear frequently in the journal for which you are writing.
So, perhaps a appears only ONCE in the abstract, then I shouldn't abbreviate it because then I would have defined an abbreviation that I would not have used again (given the concept of 'the abstract should be able to stand on its own).
The problem with (2) is that people will immediately think that the 'first instance' of should be abbreviated and don't immediately consider the 'stand-alone' idea so I'm either having to revise or try to put up a convincing argument for what I did.
Lead (hook, attention-getter, motivator) 2-4 well-developed sentences Use an anecdote (a little story), startling facts, surprising…
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