9

You can get your equation in unevaluated form using

```
ToExpression["\\int_0^\\infty E^{-x^2}\\,dx = \\frac{\\sqrt\\pi}2", TeXForm, HoldForm]
```

which wraps the expression in `HoldForm`

before evaluation. Note the thin space before `dx`

, which is needed for *Mathematica* to properly interpret the integral syntax, and the capital `E`

.

```
ToExpression["{HoldForm}[\\int_0^\\infty E^{-x^2}\\,dx = \\frac{\\sqrt\\pi}2]", TeXForm]
```

also works to get the held form.

You need to add a thin space before the

`dx`

:`ToExpression["\\int_0^\\infty e^{-x^2}\\,dx = \\frac{\\sqrt\\pi}2",TeXForm]`

. – Simon Rochester – 2015-09-25T04:21:17.237@SimonRochester When I do that it returns a "ConditionalExpression", a completely wrong interpretation of the TeX string which should be an integral. – Tyler Durden – 2015-09-25T04:40:50.250

Mathematica is doing the integral, with the

`e`

interpreted as an arbitrary variable. Change the`e`

to`E`

and Mathematica will verify your equation. – Simon Rochester – 2015-09-25T04:45:36.677