We consider polynomial mappings (f,g) of ℂ² with constant nontrivial jacobian. Using the Riemann-Hurwitz relation we prove among other things the following: If g - c (resp. f - c) has at most two branches at infinity for infinitely many numbers c or if f (resp. g) is proper on the level set (resp. ), then (f,g) is bijective.
@article{bwmeta1.element.bwnjournal-article-apmv55z1p95bwm, author = {Ludwik M. Dru\.zkowski}, title = {A geometric approach to the Jacobian Conjecture in $\mathbb{C}$$^2$}, journal = {Annales Polonici Mathematici}, volume = {55}, year = {1991}, pages = {95-101}, zbl = {0772.14006}, language = {en}, url = {http://dml.mathdoc.fr/item/bwmeta1.element.bwnjournal-article-apmv55z1p95bwm} }
Ludwik M. Drużkowski. A geometric approach to the Jacobian Conjecture in ℂ². Annales Polonici Mathematici, Tome 55 (1991) pp. 95-101. http://gdmltest.u-ga.fr/item/bwmeta1.element.bwnjournal-article-apmv55z1p95bwm/
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