\documentclass[12pt,
a4,
twoside,
openright]{book}
Above is from my university master thesis template, I checked other schools templates, they all use a4paper, is a4
=a4paper
?
And I do not find geometry
in my template, does it mean my template uses default a4 size? Is there a standard(or widely accepted) size for thesis?
a4
?a4paper
is the optiona4
is not defined for thebook
class (so it does nothing, except issuing a warning), whereasa4paper
is.a4
is in thedocumentclass
option list, not\usepackage{a4}
?a4
option might be processed there.