8. Skribilo User Manual — Equation Formatting |

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Skribilo comes with an equation formatting package. This package may be loaded by adding the following form at the top of your document:

It allows the inclusion of (complex) equations in your documents, such as, for example, the following: This chapter will describe the syntactic facilities available to describe equations, as well as the rendering options.To start with, let's have a look at a concrete example.

... produces:

Fortunately, the `eq` package allows for the use of a
much simpler syntax.

... produces:

It is possible to create *equation display blocks*,
where several equations are displayed and aligned according to a
particular operator.

(p[Thisparagraphcontains thisequation:,(eq:inline?#t '(/ alpha beta)). This is actually an ,(emph[inline]) equation, meaning thatitoccurs within a paragraph. Typesetting has to be adjusted accordingly.]) (eq-display (p[This is an equation display block, within which equations can be aligned with one another.]) (eq:ident"eq-limit-b-over-l":renderer(and %have-lout? 'lout):align-with'= '(= (limit (/lambdabeta) 0 (apply IPL n k));; non-simplified(/ (expt (+ alpha beta) k) (* beta (sum:from(= x 0):to(- k 1) (* (combinations k x) (expt beta (- k 1 x)) (expt alpha x)))))))[This equation can be simplified asfollows:](eq:ident"eq-limit-b-over-l-simplified":renderer(and %have-lout? 'lout):align-with'= '(=;; simplified(/ (expt (+ alpha beta) k) (- (expt (+ alpha beta) k) (expt alpha k))) (limit (/lambdabeta) 0 (apply IPL n k)))))

... produces:

This paragraph contains this equation: *α / β*. This is actually an *inline* equation, meaning that it
occurs within a paragraph. Typesetting has to be adjusted
accordingly.

This is an equation display block, within which equations can be aligned with one another.

This equation can be simplified as follows:

The options available for the top-level `eq`

markup
are summarized here:

**(****eq** [**:number** `#t`

] [**:mul-style** `'space`

] [**:div-style** `'over`

] [**:renderer**] [**:align-with**] [**:inline?** `'auto`

] [**:class** `"eq"`

] [**:ident**]**)**

`auto`

, Skribilo will
automatically determine whether the equation is to be "in-line".
Otherwise, it should be a boolean indicating whether the equation is to
appear "in-line", i.e., within a paragraph. If the engine supports it,
it may adjust various parameters such as in-equation spacing
accordingly. lout `#f`

, then the
equation is left unnumbered. Note that this option is only taken into
account for displayed equations. lout `space`

, `cross`

, `asterisk`

or `dot`

. lout `over`

, `fraction`

,
`div`

and `slash`

. Per-`eq:/`

`:div-style`

options override this setting. lout `eq-display`

block,
this should be a symbol specifying according to which operator equations
are to be aligned with one another. lout Equation display blocks can be defined using `eq-display`

. Display blocks define the scope of the alignment among
equations as specified by the `:align-with`

options of `eq`

.

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