X edit
Y edit
Alfred Young - yoga of weights (algebraic geometry) - Yano formula - Yoneda pairing
Z edit
Zariski surface - Zariski Riemann surface - Zariski space - Zero-cycle - Zoll surface - Zonal spherical function - Zhukovsky-Kutta aerofoil - Zonal spherical function -
Zaremba theorem (Hlawka-Zaremba theorem - Stott-Zaremba theorem - Zaremba criterion) Zariski's main theorem - Zariski's theorem on holomorphic functions - Zeeman's comparison theorem