work on limits section

quarto/index.qmd

@@ -68,11 +68,25 @@ and loads some useful packages that will be used repeatedly.
 These notes are presented as a Quarto book. To learn more about Quarto
 books visit <https://quarto.org/docs/books>.
 
+<!--
 These notes may be compiled into a `pdf` file through Quarto. As the result is rather large, we do not provide that file for download. For the interested reader, downloading the repository, instantiating the environment, and running `quarto` to render to `pdf` in the `quarto` subdirectory should produce that file (after some time).
+-->
 
 To *contribute* -- say by suggesting addition topics, correcting a
 mistake, or fixing a typo -- click the "Edit this page" link and join the list of [contributors](https://github.com/jverzani/CalculusWithJuliaNotes.jl/graphs/contributors). Thanks to all contributors and a *very* special thanks to `@fangliu-tju` for their careful and most-appreciated proofreading.
 
+## Running Julia
+
+`Julia` is installed quite easily with the `juliaup` utility. There are some brief installation notes in the overview of `Julia` commands. To run `Julia` through the web (though in a resource-constrained manner), these links resolve to `binder.org` instances:
+
+
+* [![Binder](https://mybinder.org/badge_logo.svg)](https://mybinder.org/v2/gh/jverzani/CalculusWithJuliaBinder.jl/main?labpath=blank-notebook.ipynb) (Image without SymPy)
+
+
+* [![Binder](https://mybinder.org/badge_logo.svg)](https://mybinder.org/v2/gh/jverzani/CalculusWithJuliaBinder.jl/sympy?labpath=blank-notebook.ipynb) (Image with SymPy, longer to load)
+
+
+
 ----
 
 Calculus with Julia version {{< meta version >}}, produced on {{< meta date >}}.