While there has been scholarly attention to the politics of the third wave of regionalism in South America, this typically focuses on the performance of the Executive Branch rather than the domestic constraints. This article innovatively compares the behaviour of Mercosurian parliaments to understand their role in regional integration. It contributes to Foreign Policy Analysis, by drawing on Qualitative Comparative Analysis to systematically identify the configurations of conditions for rapid approval of enlargement treaties and investigate the impact of national parliaments. Nine cases are analysed related to the episodes of enlargement of Mercosur to empirically test the political conditions to achieve fast approval of treaties. The key finding is that domestic support (channelled in national parliaments) is important to confirm and conduct international projects – and specifically regional integration. This has implications for understanding the possibilities for how future accessions to Mercosur and other regional organisations will take place.
We know from a result due to Noether–Lefschetz that a very general surface of degree at least 4 in [Formula: see text] contains only curves which are complete intersections with other surfaces. The main goal of this paper is to construct an explicit and smooth compactification of a parameter space for surfaces in [Formula: see text] of degree [Formula: see text] for all sufficiently large [Formula: see text], containing one conic and one line. The construction also applies to surfaces in [Formula: see text] containing one plane curve and one line. As an application, we compute the degree of the locus of surfaces of degree [Formula: see text] containing one conic and one line.
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