### This 8-line summary of textbook physics agrees with 400 years of experiments.

8 lines state that general relativity and the
standard model of particle physics describe all of nature. The free physics
volume telling more about each line is linked.

1. Nature dislikes squander: | dW = 0 | Action W=∫L dt is minimized in every motion.
Locally, L = E_{kin}-E_{pot}. | Vol. I: Fall, Flow and Heat. |

2. Nature dislikes hurrying: | v ≤ c | Energy speed v is limited by the speed of light c. | Vol. II: Chapters
on Special Relativity. |

3. Nature dislikes excessive force: | F ≤ c^{4}/4G | Force F is limited by c and the gravitational constant G. | Vol. II: Chapters
on General Relativity and Cosmology. |

4. Nature dislikes sloth: | W ≥ ℏ | Action W is never smaller than the quantum of action ℏ. | Vol. IV: The Quantum of Change. |

5. Electric charges are conserved and attract or repel: | U(1) | is the symmetry of electromagnetism. | Vol. III: Light, Charges and Brains. |

6. Nuclei show two other types of charges and forces: | SU(3) and broken SU(2) | are the symmetries of the two nuclear interactions. | Vol. V: Pleasure, Technology and Stars. |

7. Nature determines the elementary particles: | About 18 particles | with their charges and properties make up everything. | Vol. V: Pleasure, Technology and Stars. |

8. Nature determines the fundamental constants: | About 25 numbers | – dimensions, coupling constants, particle mass ratios, mixings – determine all observations, colours & beauty. | Vol. V: Pleasure, Technology and Stars. |

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No known observation contradicts these
eight lines.

The eight lines determine all equations of physics:

Lines 1, 2 and 3, together, uniquely determine special and general relativity, cosmology, the Hilbert Lagrangian and Einstein's field equations. References below.

Lines 1, 2 and 4 to 8, together, uniquely determine quantum field theory and the Lagrangian of the standard model of particle physics, with massive neutrinos.

The eight lines contain physics, chemistry, material science, biology, medicine, geology, astronomy, engineering and computer science.

The eight lines resulted from the work of millions of scientists and engineers.

Galileo started around the year 1600. Line 5 arose around 1860, lines 2 and 4 around 1900, line 3 from 1915 to 2002, and lines 6, 7 and 8 from 1936 to 1973.

The eight lines contain all present knowledge about nature. They summarize and contain all textbook physics.

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Three questions are open in fundamental
physics.

I*all observations* in nature described by
the 8 lines – or are there phenomena *beyond* them, i.e.,
beyond present textbook
physics?

For example, to which line do dark matter and dark energy belong exactly?

II*common explanation* for
the 8 lines – or is there none?

In particular, what determines
lines 5 to 8, i.e., the force spectrum, the particle spectrum and the
fundamental constants?

Lines 5 to 8 contain the only
known physics effects unexplained by and thus beyond the standard model.

III Are there any *undiscovered
lines*
– or will F ≤ c^{4}/4G remain the last law of
physics?

Explored mainly in the years
from 1993 to 2002, the force limit is, arguably, the last law of physics
discovered so far. The limit value c^{4}/4G ≈ 3.0 ·
10^{43} N for the local force has passed all checks. It allows
deducing Einstein's field equations and is the shortest known summary of
general relativity.

Enjoy searching for answers.

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The main references about maximum force follow –
because line 3 was the last one to be added to the 8 lines.

V. de Sabbata & C. Sivaram, On limiting field strengths in gravitation, Found. Phys. Lett. 6, 561-570 (1993). doi.org/10.1007/BF00662806.

L. Kostro & B. Lange, Is c^{4}/G the greatest possible force in
nature?, Phys. Essays 12, 182-189 (1999).

G.W. Gibbons, The maximum tension principle in general relativity, Found. Phys. 32, 1891-1901 (2002). doi.org/10.1023/A:1022370717626.

C. Schiller, General relativity and cosmology derived from principle of maximum power or force, Int. J. Theor. Phys. 44, 1629-1647 (2005). doi.org/10.1007/s10773-005-4835-2.

M.P. Dabrowski & H. Gohar, Abolishing the maximum tension principle, Phys. Lett. B 748, 428-431 (2015). doi.org/10.1016/j.physletb.2015.07.047. The paper shows that in other models of gravity, the maximum force does not hold.

Numerous additional papers have treated the topic of
maximum force, mostly confirming it. The latest attempts to construct
counter-examples were published by V. Faraoni, Phys. Rev. D 103, 124010
(2021) and by A. Jowsey & M. Visser, arXiv:2102.01831. However, because
these publications added forces acting at different locations in space, the
counter-examples turn out to be only *apparent*.
A detailed exploration shows that, in the claimed configurations of those
papers, *local* maximum force is never exceeded, as explained in C.
Schiller, Comment on "Maximum force and cosmic censorship", Physical Review
D 104 (2021) 068501
10.1103/PhysRevD.104.068501, free preprint here.

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