# Finite and infinitesimal strain

### The displacement gradient tensor

### Infinitesimal strain and rotation

### The axial vector

### Finite strain in two dimensions

### Lagrangian strain tensor

### Infinitesimal strain

### Principal strains

**Caution there is a sign error in this equation, it should be e1/2 = (e11+e22)/2 +/- ... in this equation!!**

### Rotation

### Dilatatation

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