ON OVERTWISTED CONTACT SURGERIES

In this paper, we obtain a new result for overtwisted contact $(+1/n)$-surgery. We also give a counterexample to a conjecture by James Conway on overtwistedness of manifolds obtained by contact surgery.

Transprk a no-touch Procedure to Refractive Surgery – Two Years Study

The TransPRK (Transepithelial Photo Refractive Keratectomy) by Amaris 750S a Schwind Thecnology Is a refractive procedure with no-contact surgery. Corneal epithelium is removed by the laser without manual interference.It brings more accurity and perfect deepithelization.

On the mean Euler characteristic of contact manifolds

We express the mean Euler characteristic (MEC) of a contact structure in terms of the mean indices of closed Reeb orbits for a broad class of contact manifolds, the so-called asymptotically finite contact manifolds. We show that this class is closed under subcritical contact surgery and examine the behavior of the MEC under such surgery. To this end, we revisit the notion of index-positivity for contact forms. We also obtain an expression for the MEC in the Morse–Bott case.