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In physics, precisely in the study of the theory of general relativity and many alternatives to it, the post-Newtonian formalism is a calculational tool that expresses Einstein's (nonlinear) equations of gravity in terms of the lowest-order deviations from Newton's law of universal gravitation.
A Principal protected note (PPN) is an investment contract with a guaranteed rate of return of at least the amount invested, and a possible gain.. Although traditional fixed income investments such as guaranteed investment certificates (GICs) and bonds provide investment security with little or no risk of capital loss, they provide modest returns.