An open, horizontally-lined notebook displays handwritten mathematical notes in blue ink, presumably located in Jos, Nigeria

An open, horizontally-lined notebook displays handwritten mathematical notes in blue ink, presumably located in Jos, Nigeria. The left page contains explanatory text, including terms like "interval," "real value," "[a, b]," and "values of," consistent with mathematical definitions. The right page primarily features complex algebraic equations, likely related to numerical analysis or polynomial interpolation, specifically showing components of Lagrange interpolation. Formulas define coefficients A₀, A₁, A₂, and Aₙ, involving quotients of function values and products of differences of x-terms (e.g., `A₀ = f(x₀) / [(x₀ - x₁)(x₀ - x₂) ... (x₀ - xₙ)]`). Subsequent lines show the construction of f(x) as a sum of such terms, with examples like `f(x) = A₀ (x - x₁) (x - x₂) ... (x - xₙ)` and a term for y=f(x) represented as a product of (x - xᵢ) terms divided by (x₀ - xᵢ) terms, multiplied by f(x₀). The background, slightly out of focus, shows faint outlines of what appears to be other papers or a book. No individuals or specific actions are depicted.