“…Henceforth we will define the 'objective modal structure' of reality in terms of laws of nature, in accordance with the view that laws of nature can be regarded as a form of objective modal structure, which is advocated in refs [13,29,48] amongst others. In order to formalise this modal structure, we will employ the framework developed in [6,8], which characterises laws of nature in modal terms as constraints. This approach is inspired by the increasing prominence of constraint-based laws in physics, as surveyed in [6,8]; a very similar account of lawhood in terms of constraints was also recently given by [19].…”