Updated f string and added a small explanation in the note for clarity.

Author: alex-rowden

notebooks/07_annotations.ipynb

@@ -541,7 +541,7 @@
     "\n",
     "for i, (xlabel, ylabel) in enumerate(zip([0.5, 1.6, 2.8, 4.2], [0.95, 0.6, 0.5, 0.45])):\n",
     "    p.line(x, jv(i, x), line_width=3, color=PiYG[4][i])\n",
-    "    p.add_layout(Label(text=r\"$$J_\" + str(i) + \"(x)$$\", x=xlabel, y=ylabel))\n",
+    "    p.add_layout(Label(text=rf\"$$J_{i}(x)$$\", x=xlabel, y=ylabel))\n",
     "\n",
     "show(p)"
    ]
@@ -554,11 +554,11 @@
     "\n",
     "- Use of standard LaTeX delimeters of ``$$``. Other options are available.\n",
     "- Use raw Python strings e.g. ``r\"$$\\alpha$$\"`` so that backslashes are interpreted as normal characters rather than control sequences. \n",
+    "    - Raw strings can be used in conjunction with f-strings by using 'rf'.\n",
     "- ``Div`` and ``Paragraph`` accept LaTeX for just part of their contents, but for all other elements the whole contents must be LaTeX.\n",
     "    - To put normal text in a LaTeX string use ``\\text{...}``.\n",
     "    - We are actively working on improvements in this area.\n",
     "\n",
-    "\n",
     "#### Where can LaTeX be used?"
    ]
   },