Spacetime/Talk

Summaries of earlier Talk (see [1])

Space-time vs. Spacetime

Examples of use of spacetime:

• Weisstein's encyclopedia http://www.treasure-troves.com/physics/
• D. J. Griffiths' Introduction to Electrodynamics (Upper Saddle River, N. J.: Prentice-Hall, 1989)
• numerous books with spacetime in title
  • E. F. Taylor and J. A. Wheeler, Spacetime Physics (San Francisco: W. H. Freeman, 1966)
• Caltech class: "Spacetime 101"
• .edu matches online are almost exclusively for spacetime

Examples of use of space-time:

• Brehm & Mullin, Introduction to the Structure of Matter (ISBN 047160531X (amazon.com, search))
• Merriam-Webster http://www.m-w.com
• space-time about four times as many hits as spacetime on AltaVista?

The Spacetime four vector

The space-time four vector is:

[x y z ct]

the use of the vector as:

[x y z ict]

was common about 40 years ago or so, but it is now considered archaic and the former notation is prefered.--BlackGriffen

However, there are certainly physicists who prefer the i notation, including [Jack Sarfatti].

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