If e and
- if e and a be the emissive power
- if e and b are the electric and magnetic
- if e and f are independent events
- if e and u are the electric permittivity
- if e and k represent
- if e and t leave the alphabet
- if e and eu0026#39; are the eccentricities of the hyperbola
- if e and h represents the intensity
- if e and eu0026#39; are the eccentricities of the ellipse
- if e and g respectively
