Preface -- Antonio Campillo: A Portrayal of his Life and Work -- Singularities in Positive Characteristic Equisingularity, Classification, Determinacy: Dedicated to Antonio Campillo on the occasion of his 65th birthday -- Ultrametric spaces of branches on arborescent singularities -- Two points of the boundary of toric geometry -- On the Milnor formula in arbitrary characteristic -- Foliations in the plane uniquely determined by minimal subschemes of its singularities -- Newton transformations and the motivic Milnor fiber of a plane curve -- Nash modification on toric curves -- A recursive formula for the motivic Milnor fiber of a plane curve -- On Hasse--Schmidt derivations: the action of substitution maps -- An introduction to resolution of singularities via the multiplicity -- Platonic Surfaces -- Coverings of rational ruled normal surfaces -- Ulrich bundles on Veronese surfaces -- Multiple structures on smooth on singular varieties -- Smoothness in a family of varieties with dihedral symmetry and the DFT matrix -- The Greedy Algorithm and the Cohen-Macaulay property of rings, graphs and toric projective curves -- Binomial ideals and congruences on $\mathbb{N}^n$ -- The $K$-theory of toric schemes over regular rings of mixed characteristic -- On finite and nonfinite generation of associated graded rings of Abhyankar valuations -- Symbolic powers of monomial ideals and Cohen-Macaulay vertex-weighted digraphs -- Asymptotics of reduced algebraic curves over finite fields -- The Poincaré polynomial of a linear code -- The Metric Structure of Linear Codes -- On some properties of $A$ inherited by $C_{b}(X,A)$ -- A fractional partial differential equation for theta functions -- On continued fractions.