wish to use abbreviations to insert repetitive equations in line in text. can this be done through autocorrect facility? thank you
Not with AutoCorrect, but you can use AutoText instead without a problem. Insert your equation, select it as if it were text and then go to Tools → AutoText, provide a name and a shortcut and accept. Now, on any document, type your shortcut and press F3 to activate it.
(I talk about AutoText and AutoCorrect on my free book about Writer 
)