“…Very recently, the equal area law of HEE was proved to hold for the FPT in the HEE-temperature plane [22]. Based on [20], VDP phase transition of HEE in various AdS black holes have been studied in [23,24,25,26,27,28,29,30,31,32]. All of these works showed that the HEE undergoes the same VDP phase transition as that of the BHE.…”