Changes

:... of spherical shell of radius <math>r</math> of galaxies around "point zero" and thickness <math>dr</math> gives number  

:... of spherical shell of radius <math>r</math> of galaxies around "point zero" and thickness <math>dr</math> gives number  

:<math>m_{shell}=4 \pi \rho r^2dr</math>,

::<math>m_{shell}=4 \pi \rho r^2dr</math>,

:where <math>m_{shell}</math> is the mass of whole thin (of thickness <math>dr</math>) shell of galaxies of radius <math>r</math> and

:where <math>m_{shell}</math> is the mass of whole thin (of thickness <math>dr</math>) shell of galaxies of radius <math>r</math> and

:<math>F_{shell}=(G/c^2)[E_o-E_d(r)m_{shell}/r^2</math>

::<math>F_{shell}=(G/c^2)[E_o-E_d(r)m_{shell}/r^2</math>

==== Step 3. Calculating sum of all forcess acting on the shell ====

==== Step 3. Calculating sum of all forcess acting on the shell ====