... headset1.1
This is also referred to as a head mounted display or HMD. 
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... left.3.1
Perhaps coders who speak Arabic or Hebrew are not confused about this. 
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....3.2
Recall that to transpose a square matrix, we simply swap the $ i$ and $ j$ indices, which turns columns into rows. 
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...display!retina.5.1
This is equivalent to a density of $ 165$ pixels per mm$ ^2$, but we will use linear inches because it is the international standard for display comparisons. 
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... forth!5.2
This frequently happened to the author while developing and testing the Oculus Rift. 
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... as8.1
The parameter $ s$ is used instead of $ t$ to indicate that it is integrated away, much like the index in a summation. 
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... yields8.2
If this is unfamiliar, then look up the derivatives of sines and cosines, and the chain rule, from standard calculus sources (for example, [326]). 
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....8.3
This assumes models contain all of the points on their boundary and that they have finite extent; otherwise, topological difficulties arise [123,165] 
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... determined.9.1
Global positioning systems (GPS) work in this way, but using radio signals, the Earth surface constraint, and at least one more satellite eliminate time synchronization errors. 
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... produced.11.1
The values are also discretized, and are represented using floating-point numbers. This level of discretization will be ignored. 
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... world.12.1
To be more mathematically precise, $ \mu_i$ is the limiting case of applying $ x_i$ to an infinite number of people with the assumption that they all respond according to a normal distribution with the same mean. 
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