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Contract Type FiledDecember 22nd, 2020Also Ωinf denotes the corresponding module for Rinf. It is the free Rinf-module with basis d log(xˇi), 1 ≤ i ≤ d. We denote by ∂i the dual basis of logarithmic derivations of Rinf or Rcrys (∂i = xˇi ∂/∂xˇi). They satisfy the identity (for 0 ≤ i ≤ d and φ(xi) = xp)