It is worth warning that the negative sign is not a triviality which can be adapted with "logic" when managing exponential functions; e7.3891 is dramatically different from e- 0.1353. 1. Hay SN, Monk TG, Brecher ME.
Cabe advertir que, cuando se manejan funciones exponenciales, el signo negativo no es una trivialidad que se acomode con"lógica" es totalmente diferente e7,3891 que e-0,1353.