This expository paper considers real cubic plane curves as combinations C=a₁ T₁ + a₂ T₂ of two real triangles meeting in nine distinct points. Our study of hexagonal pencils , defined by C with parameters aᵢ ∈ R , picks up on some themes of a recent paper on cubics by Bonifant and Milnor (2017).
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Langer et al. (2024) studied this question.
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