Changes

==== Step 4. Integrating both sides of above equation ====

==== Step 4. Integrating both sides of above equation ====

:<math>-d E_d(r)/dr =(4 \pi G \rho/c^2)\int[E_o-E_d(r)]dr</math>.

::<math>-d E_d(r)/dr =(4 \pi G \rho/c^2)\int[E_o-E_d(r)]dr</math>.

:... over all spherical shells between "point zero" and <math>r</math> to get total energy of "dust" absorbed from photons, and then '''differentiating both sides with respect to''' <math>r</math> '''to get rid of integral on the right side''' of this equation, we get finally the starting <math>E_d(r)</math> where subscript <math>d</math> now, as before,  means ''"volume of universe of radius <math>r</math> around point zero"''

:... over all spherical shells between "point zero" and <math>r</math> to get total energy of "dust" absorbed from photons, and then '''differentiating both sides with respect to''' <math>r</math> '''to get rid of integral on the right side''' of this equation, we get finally the starting <math>E_d(r)</math> where subscript <math>d</math> now, as before,  means ''"volume of universe of radius <math>r</math> around point zero"''

:<math>-d^2 E_d(r)/dr^2 =(4 \pi G \rho/c^2)[E_o-E_d(r)]</math>.

::<math>-d^2 E_d(r)/dr^2 =(4 \pi G \rho/c^2)[E_o-E_d(r)]</math>.

==== Step 5: Setting differential equation controlling the redshift ====

==== Step 5: Setting differential equation controlling the redshift ====