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A commentary on Teichmüller's paper "Verschiebungssatz der quasikonformen Abbildung" (A displacement theorem of quasiconformal mapping)
This is a commentary on Teichmuller's paper Ein Verschiebungssatz der quasikonformen Abbildung (A displacement theorem of quasiconformal mapping), published in 1944. We explain in detail how Teichmuller solves the problem of finding the quasiconformal mapping from the unit disc to itself, sending 0 to a strictly negative point on the …