Aaron Lang developed formal verification proofs for NonZero integer operations in the model-checking/verify-rust-std repository, focusing on core numeric methods such as rotate_left, rotate_right, cmp, max, min, clamp, and count_ones. Using Rust and the Kani verification tool, Aaron expanded coverage to multiple integer sizes and signedness, ensuring edge-case behaviors were rigorously checked. This work integrated formal verification into the Rust std-like verification suite, enhancing reliability and safety guarantees for downstream users. The approach demonstrated a deep understanding of formal methods, Rust programming, and automated testing, resulting in more robust numeric operations without introducing new bugs during the period.