Equation Icon  d ∫ d ∫ f (±R, x ) ∫ ( Λ™f f ) B± [f ] = lim πœ–--- δ± (σ + πœ–)f (x)d4x = lim πœ–--- ----------d3x = lim πœ– ± --2 − --3 d3x πœ–→0+ ∫dπœ– πœ–→0+∫ dπœ– R πœ–→0+ R R -πœ–-( 3 Λ™ 2 ) 3 2π- ( 3 Λ™ 2 ) 3 = πœ–li→m0+ R5 ±R f − R f d x = 3 δ3(x ) ±r f − r f d x = 0,