Example image of eyePlorer eyePlorer map for 'Y-Δ transform': Arthur E. Kennelly Delta (letter) United Kingdom Glossary of graph theory Graph theory Cycle (graph theory) Equivalence class AC motor Alternating current Electrical network Network analysis (electrical circuits) Polyphase system Single-phase electric power Three-phase electric power Tietze's graph List of transforms Mikhail Dolivo-Dobrovolsky Motor soft starter Dürer graph Flower snark Cycle double cover Static inverter plant Resistor Topology (electronics) Dual impedance Thévenin's theorem Petersen graph