calculation – Typesetting reasoned calculations, also called calculational proofs

The calculation environment formats reasoned calculations, also called calculational proofs.

The notion of reasoned calculations or calculational proofs was originally advocated by Wim Feijen and Edsger Dijkstra. The package accepts options fleqn and leqno (with the same effect as the LaTeX options fleqn and leqno, or may inherit the options from the document class). It allows steps and expressions to be numbered (by LaTeX equation numbers, obeying the LaTeX \label command to refer to these numbers), and a step doesn't take vertical space if its hint is empty. An expression in a calculation can be given a comment; it is placed at the side opposite to the equation numbers. Calculations are allowed inside hints although numbering and commenting is then disabled.

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