Alternative Equation Formats

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MathML

| f (ψ^{(k - 1)}) - f (ψ^{(k)}) | \leq r

| f (ψ^{(k - 1)}) - f (ψ^{(k)}) | \leq r

\[ |f(\bpsi ^{(k-1)}) - f(\bpsi ^{(k)})| \leq r \]