26,291 research outputs found
Are Crises Good for Long-Term Growth? The Role of Political Institutions
This paper provides empirical evidence for the importance of institutions in determining the outcome of crises on long-term growth. Once unobserved country-specific effects and other sources of endogeneity are accounted for, political institutions affect growth through their interaction with crises. The results suggest that only countries with strong democracies, high levels of political competition and external constraints on government can potentially benefit from crises and use them as opportunities to enhance long-term output per capita and productivity growth.
Locally equivalent Floer complexes and unoriented link cobordisms
We show that the local equivalence class of the collapsed link Floer complex
, together with many -type invariants extracted from
this group, is a concordance invariant of links. In particular, we define a
version of the invariants and when is a link and
we prove that they give a lower bound for the slice genus .
Furthermore, in the last section of the paper we study the homology group
and its behaviour under unoriented cobordisms. We obtain that a
normalized version of the -set, introduced by Ozsv\'ath, Stipsicz and
Szab\'o, produces a lower bound for the 4-dimensional smooth crosscap number
.Comment: Remark 1.3 and acknowledgements were change
The concordance invariant tau in link grid homology
We introduce a generalization of the Ozsv\'ath-Szab\'o -invariant to
links by studying a filtered version of link grid homology. We prove that this
invariant remains unchanged under strong concordance and we show that it
produces a lower bound for the slice genus of a link. We show that this bound
is sharp for torus links and we also give an application to Legendrian link
invariants in the standard contact 3-sphere
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