A not-uncommon new user mistake is to simply type "e" when referring to the exponential constant, instead of entering the symbol or using the exp function. Maple views that as a variable, leading to results the user is not expecting and which can be difficult for a new user to diagnose. Similar situations can occur when using the variable instead of the differential . Maple 2020 now detects the cases where it seems likely that this situation is occurring, and provides a suitable warning and solution.
These warnings do not appear when the variable interpretation is appropriate.