What limits limits?

What limits meiotic crossovers?

Meiotic crossovers are points of exchange between homologous chromosomes that create genetic diversity in gametes. However, the number of crossovers (COs) is tightly constrained. At the lower limit, there is at least one CO per pair of homologous chromosomes per meiosis, and this “obligate” CO is essential for the balanced distribution of chromosomes in the gametes. At the upper end, the number...

What Limits Social Spending?

The forces that are most likely to set the ultimate limits on social spending as a share of GDP are not those usually imagined. The deadweight costs of such spending, and the taxes behind them, fail to show the predicted upward spiral. The experience of 1960–1981 shows a major role for shifts in relative age-group sizes, but with an approaching sunset to the effect of aging on social-spending p...

Generalized Covering Groups and Direct Limits

Limits in modified categories of interest

‎We firstly prove the completeness of the category of crossed modules in a modified category of interest‎. ‎Afterwards‎, ‎we define pullback crossed modules and pullback cat objects that are both obtained by pullback diagrams with extra structures on certain arrows‎. ‎These constructions unify many corresponding results for the cases of groups‎, ‎commutative algebras and can also be adapted to ...

What limits simultaneous discrimination accuracy?

Discrimination accuracy decreases when viewers simultaneously monitor two perceptually distinct stimulus components for changes in a common property, e.g. contrast [Magnussen & Greenlee (1997). Journal of Experimental Psychology: Human Perception and Performance, 23, 1603-1616; Olzak & Wickens (1997). Perception, 26, 1101-1120]. We ask whether the limitation is in monitoring two components or i...