A Δ-move.|@|~(^,^)~|@||@|~(^,^)~|@|Reidemeister moves.|@|~(^,^)~|@|Virtual moves.|@|~(^,^)~|@||@|~(^,^)~|@|State expansion.|@|~(^,^)~|@||@|~(^,^)~|@||@|~(^,^)~|@|Polar link diagrams.|@|~(^,^)~|@||@|~(^,^)~|@|Forbidden moves.|@|~(^,^)~|@|A Cn-move|@|~(^,^)~|@||@|~(^,^)~|@||@|~(^,^)~|@||@|~(^,^)~|@|The sign of a crossing.|@|~(^,^)~|@||@|~(^,^)~|@||@|~(^,^)~|@||@|~(^,^)~|@||@|~(^,^)~|@||@|~(^,^)~|@||@|~(^,^)~|@||@|~(^,^)~|@||@|~(^,^)~|@||@|~(^,^)~|@|
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