Shifts the chain complex cc by p, i.e., returns a new chain complex CS with csi = cci+p and the same differentials as cc.
i1 : R = QQ[x_1..x_4,z_1..z_4, T] o1 = R o1 : PolynomialRing |
i2 : I = ideal(z_2*z_3-z_1*z_4,x_4*z_3-x_3*z_4,x_2*z_2-x_1*z_4,x_4*z_1-x_3*z_2,x_2*z_1-x_1*z_3)
o2 = ideal (z z - z z , x z - x z , x z - x z , x z - x z , x z - x z )
2 3 1 4 4 3 3 4 2 2 1 4 4 1 3 2 2 1 1 3
o2 : Ideal of R
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i3 : cc = res I
1 5 5 1
o3 = R <-- R <-- R <-- R <-- 0
0 1 2 3 4
o3 : ChainComplex
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i4 : betti cc
0 1 2 3
o4 = total: 1 5 5 1
0: 1 . . .
1: . 5 5 .
2: . . . 1
o4 : BettiTally
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i5 : cs=shiftComplex(cc,-3)
1 5 5 1
o5 = R <-- R <-- R <-- R <-- 0
3 4 5 6 7
o5 : ChainComplex
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i6 : betti cs
3 4 5 6
o6 = total: 1 5 5 1
-3: 1 . . .
-2: . 5 5 .
-1: . . . 1
o6 : BettiTally
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