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Einstein was the first to explore the inertial mass-energy equivalence. In1905 Einstein showed that a change in energy is associated with a change ininertial mass equal to the change in energy divided by c2. In 1900 Poincar\'econsidered a device creating and emitting electromagnetic waves. The deviceemits energy in all directions. As a result of the energy being emitted, itrecoils. No motion of any other material body compensates for the recoil atthat moment. Poincar\'e found that as a result of the recoil of the oscillator,in the moving system, the oscillator generating the electromagnetic energysuffers an "apparent complementary force". In addition, in order to demonstratethe non-violation of the theorem of the motion of the centre of gravity,Poincar\'e needed an arbitrary convention, the "fictitious fluid". Einsteindemonstrated that if the inertial mass E/c2 is associated with the energy E,and on assuming the inseparability of the theorem of the conservation of massand that of energy, then - at least as a first approximation - the theorem ofthe conservation of the motion of the centre of gravity is also valid for allsystems in which electromagnetic processes take place. Before 1905 (and alsoafterwards) Poincar\'e did not explore the inertial mass-energy equivalence. In1908 Einstein wrote the German physicist Johannes Stark, "I was a littlesurprised to see that you did not acknowledge my priority regarding therelationship between inertial mass and energy".

Did Poincar\'e explore the inertial mass-energy equivalence?