Erratum to: Are Languages like Atoms? On Modelling Language Spread as a Physicist

Erratum to: Katharina Prochazka and Gero Vogl. June 2018. Are Languages like Atoms? On Modelling Language Spread as a Physicist. Glottotheory. Volume 9, Issue 1, pages 77–88. (https://doi.org/10.1515/glot-2018-0005):

Equation 1: ∂ c / ∂ t = D ⋅ ∂ 2 c / ∂ x 2

Equation 3: ∂ c 1 / ∂ t = D 1 ⋅ ∂ 2 c 1 / ∂ x 2 + c 1 [ α 1 − β 1 c 1 ] + γ c 1 c 2

Equation 4: ∂ c 2 / ∂ t = D 2 ⋅ ∂ 2 c 2 / ∂ x 2 + c 2 [ α 2 − β 2 c 2 ] − γ c 1 c 2