Wave equation, abbreviated form

Schrodinger s Wave equation may be written (in abbreviated form) as ... 

To prove this theorem formally it is first eonvenient to express the wave equation in an abbreviated conventional form. If it is written, not in the manner used hitherto,... 

Here Z is the atomic number, F s) the atomic form factor as defined by equation (5 2) in section 5, s the abbreviation given there in equation (5 3) with A now denoting the wavelength of the incident de Broglie waves. 

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