PHY.Preface:3.2 - Compare, observe and construct another use

PHY.1 determines which effects and scale relations let a physical result travel to changed conditions. PHY.5 deepens the question when a neglected effect changes that transfer.

PHY.2 constructs an arrangement whose interactions supply a wanted physical consequence. The construction must include preparation and interpretation. Similar-looking equations can suggest an analogue while leaving those physical tasks unresolved.

PHY.9 makes the wanted difference affect an indication. It develops the coupling, reference or preparation, including disturbance and ambiguity. The result supplies the observation relation used in subsequent inference or comparison.

PHY.10 constructs a physical contrast between accounts that agree under earlier conditions. It follows the changed preparation through the response and readout, retaining parameter freedom and alternative apparatus explanations. A failed comparison returns to the particular premise that can change it.

PHY.3 derives a bound or impossibility from the complete transformation and an admissible comparison. That result may finish the question or show which physical premise a different construction would have to change.

These connections form possible routes. They do not prescribe a ten-stage workflow. A known response can enter at measurement; an unknown interaction can enter at law construction; a useful impossibility can end work before a device or computation is built.