to the preamble and you will have the paragraphs below section. For the equations:
and as far as I understand one needs to redefine every environment after which there is no indent by default while he wants to have indents, because it is not possible to redefine the
<no-indent*> macro (“don’t indent after”), which is used in these environments to prescribe the absence of an indent, that is it is not possible to redefine
<no-indent*> e.g. to do nothing.
Please let me know if now it works for you (keeping in mind that you might have to redefine some other environments).