Figure 1From: Existence and multiplicity results for some nonlinear problems with singular ϕ-Laplacian via a geometric approach Bend-twist in various spaces: (a) a line segment in \(\pmb{\mathbb{R}^{1}}\) ; (b) a rectangle in \(\pmb{\mathbb{R}^{2}}\) ; (c) a cuboid in \(\pmb{\mathbb{R}^{3}}\) . Back to article page