*A Brief History of Time*).

Richard Feynman first came up with the idea that particles do not have one history, but rather have every possible history. This means scientists cannot say exactly how a particle traveled from A to B, but by calculating all the possible routes from A to B, they can find the most likely one.

Get the entire

*A Brief History of Time*LitChart as a printable PDF.## Sum over histories Term Timeline in *A Brief History of Time*

The timeline below shows where the term Sum over histories appears in

*A Brief History of Time*. The colored dots and icons indicate which themes are associated with that appearance.Chapter 4

**sum over histories**theory to explain this. A particle is said to travel from A to B by...

*(full context)*

Chapter 7

**sum over histories**.

*(full context)*

Chapter 8

**sum over histories**proposal, which states particles move from A to B by every possible path. Scientists know...

*(full context)*

**sum over histories**, one must use imaginary time, that is, imaginary numbers to represent time, which clears...

*(full context)*

**sum over histories**to Einstein’s ideas on gravity, the history of a particle is a complete curved space-time...

*(full context)*

**sum over histories**history offers a comprehensive account of space-time and its contents. Again, the anthropic principle can...

*(full context)*

**sum over histories**and no boundary theory, one can find which characteristics of the universe are likely to...

*(full context)*

Chapter 10

**sum over histories**, which states the universe had every possible history. But, each history would be self...

*(full context)*

**sum over histories**allows time travel on a miniscule scale. As particles follow the C, P, and T...

*(full context)*