v 3.15

Φ_{λ_{1}, λ_{2}} = V_{555} \int_{λ_{1}}^{λ_{2}} K_{λ} Φ_{e λ} d λ

${\Phi_{\lambda_1, \lambda_2} = V_{555} \int_{\lambda_1}^{\lambda_2} K_\lambda \Phi_{e \lambda} d \lambda}$

Error