That theory, a concept first proposed by Albert Einstein and often reiterated by British astrophysicist Stephen Hawking, seeks to find a single set of equations that can explain all the fundamental forces in the universe: gravity, electromagnetism, and the strong and weak interactive forces among subnuclear particles.
Other physicists disagreed with the theories of Einstein.
( z1 disagree :ARG0 ( z2 physicist :mod ( z3 other ) ) :ARG2 ( z4 theory :poss ( z5 person :name ( z6 name :op "Einstein" ) ) ) )