Arrows

• What Do “Bend Left” and “Bend Right” Mean in TikZ?
  In TikZ, bend left and bend right curve a to or edge path relative to its direction; learn the default angle, syntax, and a compilable example.
• How to Draw a Double-Headed Arrow in TikZ
  Draw a double-headed arrow in TikZ with the <-> option, or use arrows.meta for customizable arrowhead styles and a complete example.
• How to Put Two Multiline Brace Groups Around an Arrow in LaTeX
  Use amsmath's aligned environment inside scalable braces, then place the arrow between the two groups; avoid the obsolete eqnarray environment.
• How to Make a TikZ Arrow Label Perpendicular to the Arrow
  Use TikZ’s sloped node option to align a label with an arrow, then add rotate=90 to turn its baseline perpendicular to the path.
• Why Does an Arrow Disappear in a TikZ Draw Command?
  TikZ arrows can disappear when a path ends at a node center and the node covers the arrowhead. Use to or explicit shape anchors.