Ahmedou, MohamedenMohamedenAhmedouBen Ayed, MohamedMohamedBen AyedEl Mehdi, KhalilKhalilEl Mehdi2026-01-162026-01-162025https://jlupub.ub.uni-giessen.de/handle/jlupub/21239https://doi.org/10.22029/jlupub-20584In this paper, we extend the analysis of the subcritical approximation of the Nirenberg problem on spheres recently conducted in Malchiodi and Mayer(J Differ Equ 268(5):2089–2124, 2020; Int Math Res Not 18:14123–14203, 2021). Specifically, we delve into the scenario where the sequence of blowing up solutions exhibits a non-zero weak limit, which necessarily constitutes a solution of the Nirenberg problem itself. Our focus lies in providing a comprehensive description of such blowing up solutions, including precise determinations of blow-up points and blow-up rates. Additionally, we compute the topological contribution of these solutions to the difference in topology between the level sets of the associated Euler-Lagrange functional. Such an analysis is intricate due to the potential degeneracy of the solutions involved. We also provide a partial converse, wherein we construct blowing up solutions when the weak limit is non-degenerate.enNamensnennung 4.0 Internationalddc:510ddc:004