- Failed to parse (syntax error): {\displaystyle K = \frac{RT−S^2}{(1+P^2+Q^2)^2}}
Original from Differential geometry of surfaces
- Failed to parse (syntax error): {\displaystyle K = \frac{(RT − S^2)}{\left (1 + P^2 + Q^2\right )^2}}
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Original from Differential geometry of surfaces