 According to Fermi 's theory , there was also a corresponding reverse reaction , in which a neutrino combines with a proton to create a neutron and a positron : 
 According to Fermi <a href='null_genetive' title='1'><mark>'s</mark></a>theory , <a href='dey_it' title='2'><mark>there</mark></a> was also a corresponding reverse reaction , in which a neutrino <a href='uninflect' title='3'><mark>combines</mark></a> with a proton to create a neutron and a positron : 
According to Fermi  theory , it was also a corresponding reverse reaction , in which a neutrino combine with a proton to create a neutron and a positron :