Overlays

• How to Strike Through a Beamer Item After It Appears
  Use Beamer’s \alt overlay command with \sout from ulem to show an item normally first, then strike it through on later overlays.
• How to Reveal Definitions One at a Time in Beamer
  Reveal each term and definition on successive Beamer overlays with \item<+->, or use explicit overlay numbers for more control.
• How to Make Beamer Objects Appear in Different Places
  Use Beamer overlay commands to change what appears, and TikZ overlay nodes when an object must occupy precise positions on different slides.
• How to Use Beamer’s \visible with \cellcolor
  In Beamer tables, \visible hides cell content but may not hide \cellcolor’s background; control the fill separately with an overlay-aware branch.