equation icon  integral integral integral ( ) B± [f ] = lim e d- d±(s + e)f(x)d4x = lim e d-- f-(±R,-x)-d3x = lim e ± -f-- -f- d3x e-->0+ de e-->0+ de R e-->0+ R2 R3 integral ( ) integral ( ) = lim -e- ±R3f - R2f d3x = 2p- d3(x) ±r3f - r2f d3x e-->0+ R5 3 = 0,