#126 Santa Fe Live
Roman Vishniac, “Einstein at Princeton” (1941)— the work on the chalkboard, according to SLAC physicist Aaron Roodman “Those are Christoffel symbols, tensors that are used in General Relativity.” Kevin Zhou added “The way they’re arranged suggests he’s probably expanding out the Riemann tensor.” (The other photo is a classic portrait by Phillippe Halsman.)