The ams extension implements AMS math environments and macros, and macros for accessing the characters in the AMS symbol fonts. This extension is already loaded in all the components that include the TeX input jax, other than input/tex-base. See the list of control sequences for details about what commands are implemented in this extension.

To load the ams extension explicitly (when using input/tex-base for example), add '[tex]/ams' to the load array of the loader block of your MathJax configuration, and add 'ams' to the packages array of the tex block.

window.MathJax = {
  loader: {load: ['[tex]/ams']},
  tex: {packages: {'[+]': ['ams']}}

Alternatively, use \require{ams} in a TeX expression to load it dynamically from within the math on the page, if the require extension is loaded.

Since the ams extension is included in the combined components that contain the TeX input jax, it will already be in the package list. In that case, if you want to disable it, you can remove it:

window.MathJax = {
  tex: {packages: {'[-]': ['ams']}}

ams Options

Adding the ams extension to the packages array defines an ams sub-block of the tex configuration block with the following values:

MathJax = {
  tex: {
    ams: {
      multlineWidth: '100%',
      multlineIndent: '1em'
multlineWidth: '100%'

The width to use for multline environments.

multlineIndent: '1em'

The margin to use on both sides of multline environments.


The mutlineWidth option used to be in the main tex block, but as of version 3.2, it is now in the ams sub-block of the tex block. Version 3.2 includes code to move the configuration from its old location to its new one, but that backward-compatibility code will be removed in a future version.

ams Commands

The ams extension implements the following macros: \approxeq, \backepsilon, \backprime, \backsim, \backsimeq, \barwedge, \Bbbk, \because, \beth, \between, \bigstar, \binom, \blacklozenge, \blacksquare, \blacktriangle, \blacktriangledown, \blacktriangleleft, \blacktriangleright, \Box, \boxdot, \boxed, \boxminus, \boxplus, \boxtimes, \bumpeq, \Bumpeq, \Cap, \centerdot, \cfrac, \checkmark, \circeq, \circlearrowleft, \circlearrowright, \circledast, \circledcirc, \circleddash, \circledR, \circledS, \complement, \Cup, \curlyeqprec, \curlyeqsucc, \curlyvee, \curlywedge, \curvearrowleft, \curvearrowright, \daleth, \dashleftarrow, \dashrightarrow, \dbinom, \ddddot, \dddot, \DeclareMathOperator, \dfrac, \diagdown, \diagup, \Diamond, \digamma, \divideontimes, \Doteq, \doteqdot, \dotplus, \doublebarwedge, \doublecap, \doublecup, \downdownarrows, \downharpoonleft, \downharpoonright, \eqcirc, \eqref, \eqsim, \eqslantgtr, \eqslantless, \eth, \fallingdotseq, \Finv, \frac, \Game, \genfrac, \geqq, \geqslant, \ggg, \gggtr, \gimel, \gnapprox, \gneq, \gneqq, \gnsim, \gtrapprox, \gtrdot, \gtreqless, \gtreqqless, \gtrless, \gtrsim, \gvertneqq, \hslash, \idotsint, \iiiint, \impliedby, \implies, \injlim, \intercal, \Join, \leadsto, \leftarrowtail, \leftleftarrows, \leftrightarrows, \leftrightharpoons, \leftrightsquigarrow, \leftthreetimes, \leqq, \leqslant, \lessapprox, \lessdot, \lesseqgtr, \lesseqqgtr, \lessgtr, \lesssim, \lhd, \llcorner, \Lleftarrow, \lll, \llless, \lnapprox, \lneq, \lneqq, \lnsim, \looparrowleft, \looparrowright, \lozenge, \lrcorner, \Lsh, \ltimes, \lvert, \lVert, \lvertneqq, \maltese, \mathring, \measuredangle, \mho, \multimap, \ncong, \negmedspace, \negthickspace, \nexists, \ngeq, \ngeqq, \ngeqslant, \ngtr, \nleftarrow, \nLeftarrow, \nleftrightarrow, \nLeftrightarrow, \nleq, \nleqq, \nleqslant, \nless, \nmid, \nobreakspace, \notag, \nparallel, \nprec, \npreceq, \nrightarrow, \nRightarrow, \nshortmid, \nshortparallel, \nsim, \nsubseteq, \nsubseteqq, \nsucc, \nsucceq, \nsupseteq, \nsupseteqq, \ntriangleleft, \ntrianglelefteq, \ntriangleright, \ntrianglerighteq, \nvdash, \nvDash, \nVdash, \nVDash, \operatorname, \pitchfork, \precapprox, \preccurlyeq, \precnapprox, \precneqq, \precnsim, \precsim, \projlim, \restriction, \rhd, \rightarrowtail, \rightleftarrows, \rightleftharpoons, \rightrightarrows, \rightsquigarrow, \rightthreetimes, \risingdotseq, \Rrightarrow, \Rsh, \rtimes, \rvert, \rVert, \shortmid, \shortparallel, \shoveleft, \shoveright, \sideset, \SkipLimits, \smallfrown, \smallsetminus, \smallsmile, \sphericalangle, \sqsubset, \sqsupset, \square, \Subset, \subseteqq, \subsetneq, \subsetneqq, \substack, \succapprox, \succcurlyeq, \succnapprox, \succneqq, \succnsim, \succsim, \Supset, \supseteqq, \supsetneq, \supsetneqq, \tag, \tbinom, \tfrac, \therefore, \thickapprox, \thicksim, \triangledown, \trianglelefteq, \triangleq, \trianglerighteq, \twoheadleftarrow, \twoheadrightarrow, \ulcorner, \unlhd, \unrhd, \upharpoonleft, \upharpoonright, \upuparrows, \urcorner, \varDelta, \varGamma, \varinjlim, \varkappa, \varLambda, \varliminf, \varlimsup, \varnothing, \varOmega, \varPhi, \varPi, \varprojlim, \varpropto, \varPsi, \varSigma, \varsubsetneq, \varsubsetneqq, \varsupsetneq, \varsupsetneqq, \varTheta, \vartriangle, \vartriangleleft, \vartriangleright, \varUpsilon, \varXi, \vDash, \Vdash, \veebar, \Vvdash, \xleftarrow, \xrightarrow, \yen

And the following environments: align*, align, alignat*, alignat, aligned, alignedat, bmatrix, Bmatrix, cases, eqnarray*, gather*, gather, gathered, matrix, multline*, multline, pmatrix, smallmatrix, split, subarray, vmatrix, Vmatrix