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We prove some new effective results of André-Oort type. In particular, we state certain uniform improvements of the main result in [L. Kühne, Ann. of Math. 176 (2012), 651-671]. We also show that the equation X + Y = 1 has no solution in singular moduli. As a by-product, we indicate a simple trick rendering André's proof of the André-Oort conjecture effective. A significantly new aspect is the usage of both the Siegel-Tatuzawa theorem and the weak effective lower bound on the class number of an imaginary quadratic field given by Gross and Zagier. The results of this article were partially announced in the above-cited paper.
Lars Kühne. "An effective result of André-Oort type II." Acta Arithmetica 161.1 (2013): 1-19. <http://eudml.org/doc/286622>.
@article{LarsKühne2013, abstract = {We prove some new effective results of André-Oort type. In particular, we state certain uniform improvements of the main result in [L. Kühne, Ann. of Math. 176 (2012), 651-671]. We also show that the equation X + Y = 1 has no solution in singular moduli. As a by-product, we indicate a simple trick rendering André's proof of the André-Oort conjecture effective. A significantly new aspect is the usage of both the Siegel-Tatuzawa theorem and the weak effective lower bound on the class number of an imaginary quadratic field given by Gross and Zagier. The results of this article were partially announced in the above-cited paper.}, author = {Lars Kühne}, journal = {Acta Arithmetica}, keywords = {André-Oort conjecture; modular curve; effective; uniformity}, language = {eng}, number = {1}, pages = {1-19}, title = {An effective result of André-Oort type II}, url = {http://eudml.org/doc/286622}, volume = {161}, year = {2013}, }
TY - JOUR AU - Lars Kühne TI - An effective result of André-Oort type II JO - Acta Arithmetica PY - 2013 VL - 161 IS - 1 SP - 1 EP - 19 AB - We prove some new effective results of André-Oort type. In particular, we state certain uniform improvements of the main result in [L. Kühne, Ann. of Math. 176 (2012), 651-671]. We also show that the equation X + Y = 1 has no solution in singular moduli. As a by-product, we indicate a simple trick rendering André's proof of the André-Oort conjecture effective. A significantly new aspect is the usage of both the Siegel-Tatuzawa theorem and the weak effective lower bound on the class number of an imaginary quadratic field given by Gross and Zagier. The results of this article were partially announced in the above-cited paper. LA - eng KW - André-Oort conjecture; modular curve; effective; uniformity UR - http://eudml.org/doc/286622 ER -