## Posts

### What's the intuition behind the coarea formula?

### A simple definition of the exterior derivative

### Solving Underdetermined Systems of PDEs à Gromov

### My father's memories of S. S. Chern

### My Cousins' Children: 1979 vs 2018

### Anecdote: My academic history

### Pullback of a vector bundle and connection

### Anecdote: A short stint on Wall Street

### A simple way to discover the Riemann curvature tensor

### Holonomy is curvature

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