What is "First Principle" & How to Deduce from It?

[Azael]

I often se mention of first principle.
Deriver something from first principle ect.

But what on Earth does that mean I don't know if it maby we don't use any equvivalent to first principle in the swedish language or if I just happen to have missed it so far during my education. But I haven't figured out what it means.:grumpy:

to deduce something from first principle. Does it mean something like deducing something only by using the most fundamental hypothesis or axioms?

 

[ZapperZ]

I often se mention of first principle.
Deriver something from first principle ect.

But what on Earth does that mean I don't know if it maby we don't use any equvivalent to first principle in the swedish language or if I just happen to have missed it so far during my education. But I haven't figured out what it means.:grumpy:

to deduce something from first principle. Does it mean something like deducing something only by using the most fundamental hypothesis or axioms?

It is sometime also called ab initio. What it means is that you start off from the most fundamental form for the derivation, as opposed to coming up with an expression via phenomenology. For example, if you can derive a phenomena starting from the Hamiltonian, then that would be a First Principle derivation.

In superconductivity, for example, the London equation would be an example of phenomenology, while the BCS theory would be something from First Principle.

Zz.

 

[Architeuthis Dux]

I can understand your confusion about the concept of "first principle." It is not a commonly used term in everyday language, and it may not have an exact equivalent in Swedish. However, in the scientific community, it is a fundamental concept that is used to understand and explain the world around us.

First principle, also known as a basic principle or fundamental principle, refers to the most basic and essential element or assumption from which all other concepts or ideas are derived. In other words, it is the building block or foundation upon which all other knowledge is based.

In scientific research, first principles are used to understand and explain complex phenomena by breaking them down into simpler, more fundamental concepts. This approach is often used in fields such as physics, chemistry, and mathematics, where complex theories and models are built upon a few basic principles.

To deduce something from first principle means to derive or infer a conclusion or explanation using only the most fundamental assumptions or axioms. This approach is based on logical reasoning and critical thinking, rather than relying on assumptions or beliefs.

In summary, first principle is a fundamental concept in science that is used to understand and explain the world around us. It involves breaking down complex ideas into simpler, more fundamental concepts and using logical reasoning to deduce conclusions. I hope this helps clarify the meaning of "first principle" for you.