Combining the approach to Thom polynomials via classifying spaces of singularities with the Fulton-Lazarsfeld theory of cone classes and positive polynomials for ample vector bundles, we show that the coefficients of the Schur function expansions of the Thom polynomials of stable singularities are nonnegative with positive sum.
@article{bwmeta1.element.bwnjournal-article-doi-10_4064-fm195-1-3, author = {Piotr Pragacz and Andrzej Weber}, title = {Positivity of Schur function expansions of Thom polynomials}, journal = {Fundamenta Mathematicae}, volume = {193}, year = {2007}, pages = {85-95}, zbl = {1146.05049}, language = {en}, url = {http://dml.mathdoc.fr/item/bwmeta1.element.bwnjournal-article-doi-10_4064-fm195-1-3} }
Piotr Pragacz; Andrzej Weber. Positivity of Schur function expansions of Thom polynomials. Fundamenta Mathematicae, Tome 193 (2007) pp. 85-95. http://gdmltest.u-ga.fr/item/bwmeta1.element.bwnjournal-article-doi-10_4064-fm195-1-3/