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- Erbil Çetin, S. Gulsan Topal
- Mathematical and Computer Modelling
- 2010

- Erbil Çetin, Serap Topal
- 2014

Let T ⊂ R be a periodic time scale in shifts δ ± associated with the initial point t 0 ∈ T *. We use Brouwer's fixed point theorem to show that the initial value problem x ∆ (t) = p(t)x(t) + q(t), t ∈ T, x(t 0) = x 0 has a periodic solution in shifts δ ±. We extend and unify periodic differential, difference, h-difference and especially q-difference… (More)

This work is concerned with the existence of positive solutions to a nonlinear nonlocal first-order multipoint problem. Here the nonlinearity is allowed to take on negative values, not only positive values.

Let T be any time scale such that 0, 1 be subset of T. The concept of dynamic equations on time scales can build bridges between differential and difference equations. This concept not only gives us unified approach to study the boundary value problems on discrete intervals with uniform step size and real intervals but also gives an extended approach to… (More)

- Erbil Çetin, F. Serap Topal
- Computers & Mathematics with Applications
- 2012

- Erbil Cetin, Serap Topal, Xinan Hao
- 2014

and Applied Analysis 3 and integrating over [ρ(a), T , we get p (r) θ Δ (r) = p (ρ (a)) θ Δ (ρ (a)) + ∫ r ρ(a) q (t) θ (t) ∇t. (22) Since p(ρ(a)) > 0, θΔ(ρ(a)) ≥ 0, q(t) > 0, and θ(t) > 0, we obtain p(r)θΔ(r) > 0. Thus, we determine θΔ(r) > 0. This contradiction shows that the solution θ(t) is strictly increasing and positive on [ρ(a), T as desired. Similar… (More)

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