The discussion centers around an expression, e/c^2 * j * PV/nR, which participants argue is not a proper formula due to the absence of an equals sign. There is speculation about its relation to thermodynamics and whether the variable 'j' is imaginary. The conversation references the ideal gas law, T = PV/nR, and mentions a connection to MIT, suggesting that the expression may be associated with concepts taught there. Participants express frustration over the lack of clarity and the perceived triviality of the expression, indicating a sense of discontent with the discussion's depth.