### This 9-line summary of textbook physics agrees with 400 years of experiments.

9 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. Nature dislikes perfect order: | S ≥ k | Entropy S is never smaller than the Boltzmann constant k. | Vol. I (and Vol. VI) |

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

7. 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. |

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

9. 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
nine lines.

The nine 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, as told here.

Lines 1, 2 and 4 to 9, together, uniquely determine quantum field theory and the Lagrangian of the standard model of particle physics, with massive neutrinos.

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

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

Galileo started around the
year 1600; line 1 resulted after over 200 years.
Line 5 arose from 1824 to 1929, line 6 arose

around 1860,
lines 2 and 4 around 1900, line 3 from 1915 to 2002,
and lines 7, 8 and 9 from 1936 to 1973.

The nine lines contain all present knowledge about nature, including all textbook physics and all observations ever made.

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Three questions are open in fundamental
physics.

I*all* observations in nature described by
the 9 lines – or are there phenomena *beyond* present textbook physics?

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

II*common explanation* for
the 9 lines – or is there none?

In particular, what determines
line 1, the Lagrangian description of all motion?

What determines
the limits of lines 2 to 5?

And what determines
lines 6 to 9, i.e., the force spectrum, the particle spectrum and the
fundamental constants?

The lines 6 to 9 contain the *only*
known physics effects unexplained by and thus *beyond* the standard model.

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

Explored mainly in the years
from 1973 to 2002, the force limit is the law
of physics discovered last.

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.

Because line 3 on maximum
force c^{4}/4G was added to the list only recently,
a separate web page is dedicated to
it.

Enjoy searching for answers.

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