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London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
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@GA2G
You're obsessed Tommy.
S = \int d^{n}\xi \, \mathcal{L} = \int d^{n}\xi \, P(G{ab}) = \int d^{n}\xi \, \frac{\partial X^{\mu}}{\partial xi^{a}}\frac{\partial X^{\nu}}{\partial \xi^{b}}G{\mu\nu}