Squashed 'lectures/' changes from 8968d42..7306843
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7306843 Merged in changes that were inadvertently made in a subtree clone.
ed89997 Added \alertbf and Mark George’s text highlighting macros.
git-subtree-dir: lectures
git-subtree-split: 7306843
Squashed 'lectures/' changes from 394280d..5c5fb4c
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5c5fb4c • Fixed “class number plus one” so that it can now be passed to other macros as a numeric value.
git-subtree-dir: lectures
git-subtree-split: 5c5fb4c