Citizen history and data – Vintage Citizen Watches: "The “Center Second” came in many versions, and even a solid gold one, and a total of 6-7 generations for about 10 years. The first one was produced in 1948. All of them were running at 18,000 bph and came equipped with 7, 8, 9, 10, 11, 15, 16, 17 and even 19 jewels. The Center Seconds are non-hacking and don’t have a date complication. During this time they became water protected and starting from 1956 they had the Citizen Parashock system installed.
The first watch presented here is ParaShock and Water Protected and is made in about 1961. The case back is SS and screws in even though most of them had snap on case backs. I love the simplicity of the pale white dial with gold accents! The Citizen “C” logo at 12, the hour markers and the hands are all golden while all the rest of the marking are printed in black.
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Saturday, March 25, 2017
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Differential form - Wikipedia
Differential form - Wikipedia: "In the mathematical fields of differential geometry and tensor calculus, differential forms are an approach to multivariable calculus that is independent of coordinates. Differential forms provide a unified approach to defining integrands over curves, surfaces, volumes, and higher-dimensional manifolds. The modern notion of differential forms was pioneered by Élie Cartan. It has many applications, especially in geometry, topology and physics.
For instance, the expression f(x) dx from one-variable calculus is an example of a 1-form, and can be integrated over an interval [a, b] in the domain of f:
{\displaystyle \int _{a}^{b}f(x)\,dx}"
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For instance, the expression f(x) dx from one-variable calculus is an example of a 1-form, and can be integrated over an interval [a, b] in the domain of f:
{\displaystyle \int _{a}^{b}f(x)\,dx}"
'via Blog this'
Section (fiber bundle) - Wikipedia
Section (fiber bundle) - Wikipedia: "The space of continuous sections of a fiber bundle E over U is sometimes denoted C(U,E), while the space of global sections of E is often denoted Γ(E) or Γ(B,E).
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