Fundamentals of electromagnetism

This post is a list of fundamental principles of electromagnetism. There are 16 principles listed below.

1. Charged particles have an electric field in all directions (positive or negative)
2. Particles of the opposite charge attract eachother
3. Particles of the same charge repel eachother
4. Electrons have a negative charge
5. Charged particles have a magnetic field (north and south orientation)
6. Opposite magnetic poles attract eachother
7. Magnets have coordinated particles pointing in the same magnetic field
8. Electrons moving in a wire is an electric current in the opposite direction
9. Electric current is caused by a charge imbalance in a circuit or change in an magnetic field
10. An electric current creates a magnetic field curling around it (near field)
11. An accelerating electric field creates a perpendicular magnetic field (far field)
12. An accelerating magnetic field creates a perpendicular electric field (far field)
13. Electric and magnetic fields propagate together through space (far field)
14. Electromagnetic waves travel at the speed of light
15. Electromagnetic waves vary in frequency
16. Visible light is an electromagnetic wave in a specific frequency range

License: CC BY-SA 4.0

List of versions of M-theory

This post is a list of versions of M-theory. M-theory is a physics theory proposed by Edward Witten in 1995 as an attempt to unify the 5 versions of string theory. There are 5 versions listed below alphabetically. Source: Wikipedia

• E8xE8
• SO(32)
• Type I
• Type IIA
• Type IIB

List of Millennium Prize Problems

This post is a list of the Millennium Prize Problems. The Millenium Prize Problems are a list of mathematics problems proposed by the Clay Mathematics Institute in 2000. There are 7 problems listed below alphabetically. Source: claymath.org

• Birch and Swinnerton-Dyer conjecture
• Hodge conjecture
• Navier-Stokes existence and smoothness
• P versus NP
• Poincare conjecture
• Riemann hypothesis
• Yang-Mills existence and mass gap

Collection of quotes from Knowledge and Representation

This post is a list of quotes from my essay Knowledge and Representation (2018). There are 35 quotes and 7 chapters listed below chronologically.

A. Truth (3)

B. Knowledge (4)

C. Language (7)

D. Representation (4)

E. Reason (6)

F. Understanding (7)

G. Phenomena (4)

A. Truth

1. "Reality is the actual state of affairs."

2. "True is the attribute of being an accurate representation of reality."

3. "When our propositions correctly display reality, we are saying something that is true. I believe that determining whether a proposition is true or false is central to epistemology."

B. Knowledge

4. "Knowledge is a correctly justified true belief."

5. "It's necessary that knowledge is correctly justified. This means that correct justification has to be used."

6. "I believe there is a subjective line between justified and not-justified. I don't have a strict criteria for what constitutes as a good reason."

7. "Over the course of a lifetime, a person will form a giant list of beliefs about reality."

C. Language

8. "Every word corresponds to a concept (or multiple concepts)."

9. "Language is almost always subjective to a degree."

10. "A concept is a mental general representation... Concepts are mental because they only exist in the mind. Reality is full of potential concepts and only the mind or viewer can create concepts."

11. "A meaning is an underlying representation."

12. "I believe that language is formed through establishment rather than usage... Maybe with enough misuses, a new meaning can get established to coincide alongside the original meaning, but still establishment is what truly gives a word meaning."

13. "Syntax is a system of rules for the combination of words."

14. "With two exceptions, I believe it's impossible to make a 100% objective proposition about reality. The only exceptions I can think of are mathematical equations such as 2 + 3 = 5 and symbolic logic equations. I believe some of the most objective looking statements can be twisted to be purposefully misinterpreted."

D. Representation

15. "If establishing knowledge is a central goal, another goal is to create true physical representations of reality. This includes all of our models, descriptions, equations and illustrations."

16. "Although we can use pictures to display information, sometimes it's more effective to use words. This is why we often see captions attached to pictures. In this regard, descriptions have greater potential to provide knowledge than images alone."

17. "Explanations are important for understanding reality... Explanations shine light on the mysteries of reality."

18. "Mathematics is the study of numbers, lines and shapes."

E. Reason

19. "Reason is the process of forming conclusions using explicit justifications or premises."

20. "A reason is something intended to support the accuracy of a proposition."

21. "Reasons fit together to support or deny a proposition."

22. "Science is a method of establishing knowledge through controlled experiments."

23. "Logic is the process of forming conclusions using objective reasons or premises."

24. "Intuition is the process of forming beliefs based on unclear reasons."

F. Understanding

25. "Understanding is the condition of knowing the explanation of something."

26. "Understanding is the condition of having competent knowledge in something."

27. "I believe that many of our thoughts can be represented in quote form. While some thoughts can be expressed in a single sentence, other thoughts are more complex and require an entire paragraph."

28. "I enjoy collecting quotes and organizing them into clear structures. To me, structured quotes are easier to understand than continuous prose. Even when I write normally, I try to keep my paragraphs short and clear. Either way, I'm trying to organize thoughts into coherent structures."

29. "A principle is a proposition that contributes to the structure of a topic."

30. "A fundamental is a core principle."

31. "A system is a set of interrelated things that form a unified whole."

G. Phenomena

32. "I believe that every detail of experience is a phenomenon. Everything you can notice is a phenomenon. This includes every event, attribute, object, piece of information, thought, sense and anything else that can be observed."

33. "All knowledge begins with phenomenology."

34. "Memory is a bookcase that we can grab knowledge from."

35. "Experience is the totality of past and present sense data."

License: CC BY-SA 4.0