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[?] Replace product of unknown variables with a single variable?

Prakhar Swarnkar
Posted 6 years ago

I am trying to replace a group of a variable like (L^4)*(lm^4) by a single variable B. PLease suggest how to do it.
POSTED BY: Prakhar Swarnkar
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Rohit Namjoshi
Rohit Namjoshi
Posted 6 years ago

Can you provide a specific example? Maybe this?

Hold[(L^4)*(lm^4) + 3 ((L^4)*(lm^4)) + ((L^4)*(lm^4))^2] /. ((L^4)*(lm^4)) -> B // ReleaseHold
(* 4 B + B^2 *)

The Hold is required to prevent the expression from being simplified before the replacement.
POSTED BY: Rohit Namjoshi
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