national organization were completed, DeltaPhiDelta adapted as name 1963 is the year of the merger of DeltaSigma Rho, founded 000000001906-04-13-00001906年4月13日
(y-x)-\phi ^{x}(y)} ϕ x {\displaystyle \phi ^{x}} 为一个校正函数,它满足 { Δ ϕ x = 0 in Ω ϕ x = Φ ( y − x ) auf ∂ Ω {\displaystyle {\begin{cases}\Delta \phi ^{x}=0&{\text{in}}\