Derivation of the Path Integral in QFT

Here, the path integral approach is derived according to Hugh Osborn's notes.
The following introduction is excerpted from his lecture notes: “The basic message that this course tries to convey is: Quantum field theory is the basic language of particle physics, and also large parts of statistical physics. Quantum field theory is a subject with many technical complications; we will try to deal with these 'step by step'. It is, however, not a branch of mathematics yet. The lectures will not be rigorous from a pure mathematical point of view. In quantum field theory, the number of particles involved is potentially infinite, whereas ordinary quantum mechanics deals with states describing one particle or a fixed number of particles. Quantum field theory is quantum mechanics with an infinite number of degrees of freedom.”

The video is also an excerpt from the course titled "Advanced Quantum Field Theory: Intuition with Path Integrals." In this course, we take a unique approach to delve deeper into the fascinating world of Quantum Field Theory. The foundations of this course are based on the notes of Professor David Skinner, although a fresh perspective is given, which emphasizes intuition and the power of path integrals.

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