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|$$\KaTeX$$ |`Plain Text`| | ------- | ------- | |$$\Alpha$$ | `\Alpha`| |$$\Beta$$ | `\Beta`| |$$\Gamma$$ | `\Gamma`| |$$\Delta$$ | `\Delta`| |$$\Epsilon$$ | `\Epsilon`| |$$\Zeta$$ | `\Zeta`| |$$\Eta$$ | `\Eta`| |$$\Theta$$ | `\Theta`| |$$\Iota$$ | `\Iota`| |$$\Kappa$$ | `\Kappa`| |$$\Lambda$$ | `\Lambda`| |$$\Mu$$ | `\Mu`| |$$\Nu$$ | `\Nu`| |$$\Xi$$ | `\Xi`| |$$\Omicron$$ | `\Omicron`| |$$\Pi$$ | `\Pi`| |$$\Rho$$ | `\Rho`| |$$\Sigma$$ | `\Sigma`| |$$\Tau$$ | `\Tau`| |$$\Upsilon$$ | `\Upsilon`| |$$\Phi$$ | `\Phi`| |$$\Chi$$ | `\Chi`| |$$\Psi$$ | `\Psi`| |$$\Omega$$ | `\Omega`| |$$\varGamma$$ | `\varGamma`| |$$\varDelta$$ | `\varDelta`| |$$\varTheta$$ | `\varTheta`| |$$\varLambda$$ | `\varLambda`| |$$\varXi$$ | `\varXi`| |$$\varPi$$ | `\varPi`| |$$\varSigma$$ | `\varSigma`| |$$\varUpsilon$$ | `\varUpsilon`| |$$\varPhi$$ | `\varPhi`| |$$\varPsi$$ | `\varPsi`| |$$\varOmega$$ | `\varOmega`| |$$\alpha$$ | `\alpha`| |$$\beta$$ | `\beta`| |$$\gamma$$ | `\gamma`| |$$\delta$$ | `\delta`| |$$\epsilon$$ | `\epsilon`| |$$\zeta$$ | `\zeta`| |$$\eta$$ | `\eta`| |$$\theta$$ | `\theta`| |$$\iota$$ | `\iota`| |$$\kappa$$ | `\kappa`| |$$\lambda$$ | `\lambda`| |$$\mu$$ | `\mu`| |$$\nu$$ | `\nu`| |$$\xi$$ | `\xi`| |$$\omicron$$ | `\omicron`| |$$\pi$$ | `\pi`| |$$\rho$$ | `\rho`| |$$\sigma$$ | `\sigma`| |$$\tau$$ | `\tau`| |$$\upsilon$$ | `\upsilon`| |$$\phi$$ | `\phi`| |$$\chi$$ | `\chi`| |$$\psi$$ | `\psi`| |$$\omega$$ | `\omega`| |$$\varepsilon$$ | `\varepsilon`| |$$\varkappa$$ | `\varkappa`| |$$\vartheta$$ | `\vartheta`| |$$\thetasym$$ | `\thetasym`| |$$\varpi$$ | `\varpi`| |$$\varrho$$ | `\varrho`| |$$\varsigma$$ | `\varsigma`| |$$\varphi$$ | `\varphi`| |$$\digamma$$ | `\digamma`|

$$\KaTeX$$ Greek Letters

A researcher is documenting a formula and needs to write the expression: the lowercase Greek letter 'sigma' squared is equal to the sum, represented by the uppercase Greek letter 'Sigma', of 'x' subscript 'i' squared. Which of the following plain text representations correctly captures this mathematical expression?

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