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IPSUM INVARIANS: The Invariance Itself

The public record of the invariance program. est. 1 September 2026

183 articles · 6 active editors · 3,878 edits

Introduction

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The Current Program (Round 3)

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Program History

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Hamilton's Principle

Newton's laws, Maxwell's equations, general relativity and the Standard Model are each formulated as an action via Hamilton's Principle. In every case the equations of motion are consequences rather than starting points. Conservation of energy, momentum and charge are not separate laws at all — Noether proved they follow from the action's symmetries. New models are now built by writing the action contrained by symmetry and letting the dynamics follow. This is how electromagnetism and gravity were derived and how the nuclear forces were found. Hamilton's Principle alone survives the passage to quantum mechanics intact: the action becomes the phase carried by every possible history, and the classical path is simply where those phases fail to cancel. The action is the deepest thing physics knows.

A true path and several comparison paths between fixed endpoints.

• Stationary is not least — the long way round a great circle obeys the same rule at every point, and is plainly not the shortest. See the diagram.
• Why the rule holds at all — nature selects nothing. It sums over everything, and what looks like a choice is the residue left by interference.
• Start without the mathematics — every page carrying equations has a plain-language counterpart, linked from it and linking back.

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Noether's theorems

The symmetry-to-conservation map

Klein read the paper to the Göttingen Scientific Society on 26 July 1918. Its last section answers a claim of Hilbert's: that energy conservation in general relativity fails to take the form it takes everywhere else in physics. There are two theorems in the paper, and they are not versions of one another.

The first takes a symmetry with a fixed number of parameters and returns that many conservation laws, which hold for real motions. The second takes a symmetry that is allowed to differ from place to place and returns identities between the field equations — identities that hold whether or not those equations are satisfied. The second theorem is why a gauge theory has fewer independent field equations than it has fields, and why gravity has no local energy.

A 90-page reading edition: both theorems proved in full and kept apart, the mathematics they need, the physics they explain, and a plain-language counterpart for every page that carries equations.

• Göttingen and the energy problem — the question the paper was written to settle
• The primer — plain language, no mathematics
• The two theorems side by side — the distinction most accounts lose

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The Work of James Clerk Maxwell

On Physical Lines of Force

Lines of force about a bar magnet

In four instalments between March 1861 and February 1862, James Clerk Maxwell filled space with spinning cells and little rolling particles, to explain the mechanics behind magnetic fields. His machine was wrong. On the way to building it, he wrote down the displacement current, derived the speed of light from two electrical measurements that had nothing to do with optics, and founded field theory.

A 65-page reading edition: Maxwell's argument in his own order and register, the modern equations derived from his results, and a plain-language explainer for every major idea.

• Introduction — the story, and why the paper matters
• The primer — plain language, no mathematics
• The missing term — the one addition that made radio possible

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