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    "# The F# Notebook Programming Model\n",
    "\n",
    "F# Notebooks are written using the F# notebook programming model, a variation on the F# scripting programming model used for `.fsx` scripts and familiar to many F# users.\n",
    "    \n",
    "This article documents the ways that this programming model differs from normal F# scripting.\n",
    "    \n",
    "### Standard open namespaces and referenced packages\n",
    "\n",
    "The following assemblies or packages are referenced by default:\n",
    "\n",
    "* `.NETStandard.Library`\n",
    "* `FSharp.Core`\n",
    "* `Microsoft.AspNetCore.Html.Abstractions`\n",
    "* `Microsoft.DotNet.Interactive`\n",
    "* `Microsoft.DotNet.Interactive.Formatting`\n",
    "* `Microsoft.DotNet.Interactive.FSharp`\n",
    "\n",
    "The following namespaces are opened by default:\n",
    "\n",
    "* `FSharp.Core`\n",
    "* `FSharp.Control`\n",
    "* `FSharp.Collections`\n",
    "* `System`\n",
    "* `System.IO`\n",
    "* `System.Text`\n",
    "* `Microsoft.DotNet.Interactive.FSharp.FSharpKernelHelpers`\n",
    "\n",
    "Note that the final four are extra namespaces available by default in the F# notebook programming model that are not available by default in the F# scripting model.\n",
    "    \n",
    "### Referencing packages\n",
    "\n",
    "See [Referencing packages](Importing-packages.ipynb) for how package references differ.\n",
    "\n",
    "### Displaying outputs\n",
    "\n",
    "See [Displaying outputs](Displaying-output.ipynb).\n",
    "\n",
    "### Formatting outputs\n",
    "\n",
    "See [Formatting outputs](Formatting-outputs.ipynb).\n",
    "    \n",
    "### The `fsi` object and formatting outputs\n",
    "\n",
    "Currently the `fsi` object is not available by default and neither `fsi.AddPrinter` nor `fsi.AddHtmlPrinter` are supported.  See [Formatting outputs](Formatting-outputs.ipynb)\n",
    "for how to register plain text and HTML formatters.\n",
    "\n",
    "\n",
    "    \n"
   ]
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