# base/eqalignno-to-align-env Rewrite eqalignno to the standard align* environment. https://texform.dev/rules/base/eqalignno-to-align-env ## Metadata | Field | Value | | --- | --- | | Key | base/eqalignno-to-align-env | | Level | authoring | | Fidelity | reading | | Enabled by packages | base | | Profiles | Authoring, Faithful, Corpus, Equiv | ## Rewrite patterns ### parenthesized-numeric-number From: ```latex \eqalignno{#1&(#3)} ``` To: ```latex \begin{align*} #1 \tag{#3} \end{align*} ``` ### raw-numeric-number From: ```latex \eqalignno{#1} ``` To: ```latex \begin{align*} #1 \tag*{#3} \end{align*} ``` ### parenthesized-math-number From: ```latex \eqalignno{#1&(#3)} ``` To: ```latex \begin{align*} #1 \tag{$#3$} \end{align*} ``` ### raw-math-number From: ```latex \eqalignno{#1} ``` To: ```latex \begin{align*} #1 \tag*{$#3$} \end{align*} ``` ### empty-number-cell From: ```latex \eqalignno{#1&} ``` To: ```latex \begin{align*} #1 \end{align*} ``` ### missing-number-cell From: ```latex \eqalignno{#1} ``` To: ```latex \begin{align*} #1 \end{align*} ``` ### final-row-terminator From: ```latex \eqalignno{#1&(#3)\cr} ``` To: ```latex \begin{align*} #1 \tag{#3} \end{align*} ``` ### internal-empty-row From: ```latex \eqalignno{#1&(#3)\cr\cr#4&(#6)} ``` To: ```latex \begin{align*} #1 \tag{#3}\\\\#4 \tag{#6} \end{align*} ``` ### linebreak-arguments From: ```latex \eqalignno{#1&(#3)\\*[#4]} ``` To: ```latex \begin{align*} #1 \tag{#3}\\*[#4] \end{align*} ``` ### newline From: ```latex \eqalignno{#1&(#3)\newline#4&(#6)} ``` To: ```latex \begin{align*} #1 \tag{#3}\\#4 \tag{#6} \end{align*} ``` ### leading-row-scripts From: ```latex \eqalignno{#1&(#3)\cr_{#4}^{#5}#6&(#8)} ``` To: ```latex \begin{align*} #1 \tag{#3}\\{}_{#4}^{#5}#6 \tag{#8} \end{align*} ``` ## Examples Examples show the rule in isolation, not a complete normalization profile. ### eqalignno right tag branch Before: ```latex \eqalignno{F(x)&=\int_0^x f(t)\,dt&(1)\cr F'(x)&=f(x)&(2)\cr F''(x)&=f'(x)&(3)} ``` After this rule: ```latex \begin{align*} F(x)&=\int_0^x f(t)\,dt \tag{1}\\ F'(x)&=f(x) \tag{2}\\ F''(x)&=f'(x) \tag{3} \end{align*} ``` Packages: base, ams. The rendered result has pixel differences from the input. ## Triggers - [\\eqalignno](https://texform.dev/latex/commands/eqalignno) ## Eliminates - [\\eqalignno](https://texform.dev/latex/commands/eqalignno) ## Produces - [align*](https://texform.dev/latex/environments/align-star) - [\\tag](https://texform.dev/latex/commands/tag) ## Touches - [\\cr](https://texform.dev/latex/commands/cr) - [\\\\](https://texform.dev/latex/commands/-5c-) - [\\newline](https://texform.dev/latex/commands/newline) ## Same family - [ams/Bmatrix-env-to-brace-matrix](https://texform.dev/rules/ams/Bmatrix-env-to-brace-matrix): Rewrite the fenced Bmatrix environment to explicit braces around a core matrix environment. - [ams/Vmatrix-env-to-Vert-matrix](https://texform.dev/rules/ams/Vmatrix-env-to-Vert-matrix): Rewrite the fenced Vmatrix environment to explicit double bars around a core matrix environment. - [ams/bmatrix-env-to-bracket-matrix](https://texform.dev/rules/ams/bmatrix-env-to-bracket-matrix): Rewrite the fenced bmatrix environment to explicit brackets around a core matrix environment. - [ams/pmatrix-env-to-paren-matrix](https://texform.dev/rules/ams/pmatrix-env-to-paren-matrix): Rewrite the fenced pmatrix environment to explicit parens around a core matrix environment. - [ams/vmatrix-env-to-vert-matrix](https://texform.dev/rules/ams/vmatrix-env-to-vert-matrix): Rewrite the fenced vmatrix environment to explicit vertical bars around a core matrix environment. - [base/cases-to-cases-env](https://texform.dev/rules/base/cases-to-cases-env): Rewrite plain-TeX cases to the standard cases environment with row breaks. - [base/eqalign-to-aligned-env](https://texform.dev/rules/base/eqalign-to-aligned-env): Rewrite eqalign to the standard aligned environment. - [base/matrix-to-matrix-env](https://texform.dev/rules/base/matrix-to-matrix-env): Rewrite plain-TeX matrix to the standard matrix environment with row breaks. - [base/pmatrix-to-pmatrix-env](https://texform.dev/rules/base/pmatrix-to-pmatrix-env): Rewrite plain-TeX pmatrix to the standard pmatrix environment with row breaks. - [physics/antidiagonalmatrix-to-admat](https://texform.dev/rules/physics/antidiagonalmatrix-to-admat): Collapse antidiagonalmatrix to the shorter admat helper. - [physics/diagonalmatrix-to-dmat](https://texform.dev/rules/physics/diagonalmatrix-to-dmat): Collapse diagonalmatrix to the shorter dmat helper. - [physics/matrixdeterminant-to-mdet](https://texform.dev/rules/physics/matrixdeterminant-to-mdet): Collapse matrixdeterminant to the shorter mdet determinant helper. - [physics/bmqty-to-mqty](https://texform.dev/rules/physics/bmqty-to-mqty): Expand bmqty to the core mqty builder with bracket fence syntax. - [physics/mdet-to-vmqty](https://texform.dev/rules/physics/mdet-to-vmqty): Expand mdet to the vmqty determinant-style builder. - [physics/pmqty-to-mqty](https://texform.dev/rules/physics/pmqty-to-mqty): Expand pmqty to the core mqty builder with paren fence syntax. - [physics/zmat-to-xmat](https://texform.dev/rules/physics/zmat-to-xmat): Expand zmat to the explicit xmat zero-filled builder. ## Notes The second body-level AlignmentTab separates the third mathematical numbering cell; nested alignment tabs do not create new cells, and a row with more than three cells returns a normal transform error. Rows with a missing or empty number cell and actual empty rows get no tag, because \eqalignno never numbers rows automatically; the target is align* so no automatic numbers appear. A single complete outer parenthesis pair becomes \tag; otherwise retain the number verbatim with \tag*, without adding parentheses. Numeric patterns apply to ASCII-digit-only content after removal of that outer pair; all other numbering content retains its mathematical subtree inside a $...$ text-mode tag argument, including scripts, groups, fractions, text commands, and nested environments. Only a complete outer pair is removed, so (n)+(m) remains raw. Split only known body-level \cr, \\, and \newline; copy the original \\ star and optional spacing arguments, including \\*[2pt]. Remove exactly the artificial empty segment after a final terminator and omit a final default separator; retain final starred or spaced separators, consecutive internal empty rows, and explicitly terminated final empty rows. Transfer scripts and primes on a parsed separator to an empty base in the next row rather than to the preceding tag. Do not descend into explicit groups or nested environments when identifying separators. ## Disable this rule ```python TransformEngine(profile="corpus", disable_rules=["base/eqalignno-to-align-env"]) ``` ```javascript new TransformEngine({ profile: 'corpus', disableRules: ['base/eqalignno-to-align-env'] }) ``` [Open in Playground](https://play.texform.dev/?input=%5Ceqalignno%7BF%28x%29%26%3D%5Cint_0%5Ex+f%28t%29%5C%2Cdt%26%281%29%5Ccr+F%27%28x%29%26%3Df%28x%29%26%282%29%5Ccr+F%27%27%28x%29%26%3Df%27%28x%29%26%283%29%7D)