Wednesday, February 22, 2023
Friday, January 13, 2023
Wednesday, January 11, 2023
Sunday, January 01, 2023
🥳The number 23
1 + 23 = 4 × (5 – 6 + 7)
1 = 23 – 4 – 5 – 6 – 7
Furthermore, 23 is two less than 25, which is a square number;
and in two years time it will be 2025, which is another square number:
2025 = (20 + 25) × (20 + 25)
Wednesday, December 21, 2022
Thursday, December 01, 2022
😳Plain Speaking
The Plain is a two-dimensional plane, inhabited by round people and square people. Because there is not much to do in the Plain, its inhabitants spend a lot of time arguing over whether the pentagon is a circular disc with five thorns on it, or a square with one corner squashed flat and its four sides pushed out slightly by that squashing.
In the three-dimensional space around the Plain, a cylindrical person called Cyril has been watching them arguing, and he decides to give them something else to think about. As he passes through the Plain, Cyril can look like a round person or a square person, because his height is the same length as the diameter of his circular cross-section, so he pauses at various places in the Plain—sometimes looking like a round person, sometimes a square one—and says, very loudly, “I am Cyril!”
The round people take the Cyrils to be a race of round and square people who can flip over to this side of the Plain from the other side.
The square people correctly assume that “Cyril” names a single person. However, they go on to conclude that Cyril is a round square person, who is somewhere impossible when he is not visiting them. They suppose that he is visiting them now in order to show them that they were all made in his image.
Should I let them know that it was me who made them all up? A square person called Martin appears and says “I made the Plain and everyone in it.”
The other square people take him to be Cyril, and they think that he is telling them that they are right, so they set out to correct the round people.
I blame myself.
Sunday, November 13, 2022
💥Cantoring away from being Russelled
Twenty-five years ago, as I was getting my masters in mathematics, I was surprised to find an unsolved puzzle about infinity at the heart of modern mathematics. Some of my first thoughts were published in philosophy journals, so I went on to do a masters in philosophy. I got it with distinction, and by thinking laterally as well as logically I found the solution and decided to write it up as a book for a general reader with no background in philosophy, logic or mathematics. Five years later, it is down to 25,000 words.
Saturday, November 05, 2022
☀️A Dark Vulcan
Vulcan was "discovered" by Lescarbault in 1859, in the sense that he saw something that he took to be the planet hypothesized by Le Verrier earlier that year. Le Verrier was already famous for his 1846 prediction of the existence and position of Uranus:
That prediction was based on observations of the planet Neptune. Neptune was not behaving as Newtonian dynamics predicted it would, not unless there was an unobserved planet like Uranus. A few days later, Uranus was discovered by Galle, who saw it roughly where Le Verrier had said it would be.
In 1859, Le Verrier hypothesized that observations of the planet Mercury might be similarly explained, by there being a planet between Mercury and the sun. And Le Verrier was sure that Lescarbault had discovered Vulcan.
Whatever Lescarbault had seen, it was not Vulcan. In the following decades, many observations of the absence of Vulcan were made. And while some astronomers claimed to have seen Vulcan, there seemed on balance to be no such planet. Now, the motion of Mercury was eventually explained in 1915, by Einstein. But my question is this:
Why was the balance of opinion before then not for the existence of a dark Vulcan?
Physicists only had to hypothesize the existence of dark matter, out of which Vulcan was made, in order to explain their observations. If dark matter was a very heavy, very dark form of matter, ubiquitous in the universe, then most of the dark matter in the solar system would be clustered around the sun, possibly in the form of a dark Vulcan.
Physicists do say that there is dark matter in the universe. Its existence is said to explain modern astronomical observations: the stars do not behave as Einsteinian dynamics predicts, unless there is dark matter. In other words, those observations contradict Einsteinian dynamics, to some extent. Now, Einsteinian dynamics has also been contradicted by quantum-mechanical observations of Bell's inequality, to some extent. And particle physics is increasingly reminiscent of celestial epicycles, which had, much earlier, been hypothesized to explain other astronomical observations.
Did something happen to physics in the twentieth century?
Well, science did become more of a cultural phenomenon in the twentieth century.
Monday, October 31, 2022
Friday, October 21, 2022
Friday, September 09, 2022
Monday, August 01, 2022
Sunday, May 29, 2022
Friday, April 29, 2022
Saturday, April 09, 2022
Saturday, February 26, 2022
Monday, February 14, 2022
The God No One Wanted
1. The Lie of the Land
introduction | expectations | descriptions
2. The Way of Things
Cantor’s paradox | set theory | the proofs
3. Proof of Probability
too many things | the shape of time | God
4. Reasonable Doubts
just bad math | deductions | explanations
5. Doubting Reason
the final straw | Russell’s paradox | truth
