A mathematical solution for a cantilever beam that is partially restrained at only 2/3 of its depth is complex and depends on specific conditions. The discussion highlights that standard cantilever formulas assume full fixity, which may not apply when only part of the beam is restrained. The moment at the support is determined by the loading rather than the support conditions, although local stress variations can occur. Proper fixings are crucial to prevent failure, as the moment reaction must be generated regardless of the fixation method. Ultimately, partial fixity in a simple cantilever is not feasible in the same way as in multispan structures.