document$.subscribe(() => { 
  renderMathInElement(document.body, {
    delimiters: [
      { left: "$$",  right: "$$",  display: true },
      { left: "$",   right: "$",   display: false },
      { left: "\\(", right: "\\)", display: false },
      { left: "\\[", right: "\\]", display: true }
    ],
  })
})