Comment: 11 pages,No figure,Accepted for publication in Physica B

In this working paper the regional impacts of road pricing on cars are analysed taking into account externality effects from transportation on wages and productivity. In the paper the direct impacts from changes in transport costs on level of wages and productivity (=di...

We give an algorithm which decides the Nielsen-Thurston type of a given four-strand braid. The complexity of our algorithm is quadratic with respect to word length. The proof of its validity is based on a result which states that for a reducible 4-braid which is as shor...

Comment: 15 pages; comments on piecewise triviality added

Extends the simple model of the economics of controlling livestock disease as first presented by McInerney (1991) to take account of start-up costs which give use to thresholds effects. A further extension is given to allow for economics of such in disease control which...

Comment: 35 pages, published in Nonlinearity 2015

Consider n points, x 1,... , x n , distributed uniformly in [0, 1] d . Form a graph by connecting two points x i and x j if $$\Vert x_i - x_j\Vert \leq r(n)$$ . This gives a random geometric graph, $$G({\mathcal {X}}_n;r(n))$$ , which is connected for appropriate r(n). ...

Comment: 4 pages, accepted for publication

The possibility of capturing and sequestering some fraction of the CO2 emissions arising from fossil fuel combustion, often labeled as carbon capture and storage (CCS), is drawing an increasing amount of attention in the business and academic communities. We present her...