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The next stop, Room 310, contained Dr. Hsu’s algebraic structures group. A lattice diagram chalked behind the podium matched the book’s section on posets. Dr. Hsu recognized the handwriting on the map as belonging to an alum, M. Reyes, who’d been notorious for leaving "mathematical scavenger hunts" across campus. The students found a folded proof tucked inside the textbook’s margin—a clever induction that showed how to count labeled trees using Prüfer codes. On its back was written: "Proofs are bridges. Cross at 412." A lattice diagram chalked behind the podium matched
( n=1 ): LHS = 1, RHS = 1² = 1.
You can check your work instantly rather than waiting for a professor to grade it. contained Dr. Hsu’s algebraic structures group.