Within trillionths of a second after the Big Bang, they have reasoned, the primordial explosion - many billions of degrees hot - must have created a universe that contained equal quantities of matter and antimatter.
The universe has equal quantities of matter and antimatter. 
( z1 have :ARG0 ( z2 universe ) :ARG1 ( z3 mass-quantity :quant-of ( z4 and :op ( z5 matter ) :op ( z6 antimatter ) ) :ARG1-of ( z7 equal ) ) )