# Directory `macros/latex/contrib/calculation`

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 "calculation" package accepts options "fleqn" and "leqno" (with the same effect as LaTeX options "fleqn" and "leqno", and inherits these 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. In its simplest form, the LaTeX source looks like this: \begin{calculation} EXPRESSION \step{HINT} EXPRESSION \step{HINT} EXPRESSION \end{calculation} Each "HINT" is normal text, each "EXPRESSION" is mathematical text. Depending on various parameters, the output is more or less like this: EXPRESSION = { HINT } EXPRESSION = { HINT } EXPRESSION This material is subject to the LaTeX Project Public License: http://www.ctan.org/license/lppl1.3

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## 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.

Package | calculation |

Version | 1.0 |

Licenses | The LaTeX Project Public License 1.3 |

Copyright | 2014–2015 Maarten Fokkinga |

Maintainer | Maarten Fokkinga |

Contained in | TeX Live as calculation MiKTeX as calculation |

Topics | Proof Maths |