I - Dirichlet's Theorem on Arithmetic Progressions(1.5.5)
DescriptionIfaanddarerelativelyprimepositiveintegers,thearithmeticsequencebeginningwithaandincreasingbyd,i.e.,a,a+d,a+2d,a+3d,a+4d,...,containsinfinitelymanyprimenumbers.ThisfactisknownasDirichlet'sTh