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42 lines
1.2 KiB
42 lines
1.2 KiB
subroutine pvswitch4(q1,F0,F1,F2,F3,F4,F4a)
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C----from F0,F1,F2,F3,F4 calculate F4a which has all denominators
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C----shifted by q1
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implicit none
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include 'lib/TensorReduction/Include/types.f'
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include 'lib/TensorReduction/Include/TRydef.f'
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integer n1,n2,n3,n4,ep
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complex(dp):: F0(-2:0),F1(y1max,-2:0),F2(y2max,-2:0),
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. F3(y3max,-2:0),F4(y4max,-2:0),F4a(y4max,-2:0)
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real(dp):: q1(4)
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do ep=-2,0
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do n1=1,4
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do n2=n1,4
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do n3=n2,4
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do n4=n3,4
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F4a(y4(n1,n2,n3,n4),ep)=F4(y4(n1,n2,n3,n4),ep)
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. -q1(n1)*F3(y3(n2,n3,n4),ep)
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. -q1(n2)*F3(y3(n3,n4,n1),ep)
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. -q1(n3)*F3(y3(n4,n1,n2),ep)
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. -q1(n4)*F3(y3(n1,n2,n3),ep)
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. +q1(n1)*q1(n2)*F2(y2(n3,n4),ep)
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. +q1(n1)*q1(n3)*F2(y2(n2,n4),ep)
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. +q1(n1)*q1(n4)*F2(y2(n2,n3),ep)
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. +q1(n2)*q1(n3)*F2(y2(n1,n4),ep)
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. +q1(n2)*q1(n4)*F2(y2(n1,n3),ep)
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. +q1(n3)*q1(n4)*F2(y2(n1,n2),ep)
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. -q1(n1)*q1(n2)*q1(n3)*F1(n4,ep)
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. -q1(n2)*q1(n3)*q1(n4)*F1(n1,ep)
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. -q1(n3)*q1(n4)*q1(n1)*F1(n2,ep)
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. -q1(n4)*q1(n1)*q1(n2)*F1(n3,ep)
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. +q1(n1)*q1(n2)*q1(n3)*q1(n4)*F0(ep)
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enddo
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enddo
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enddo
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enddo
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enddo
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return
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end
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