
In this chapter, we summarize the basics of gravitational lensing. We derive the basic equation in gravitational lensing and summarize the relation between observables and physical quantities. We then introduce some statistical methodologies to extract cosmological information from gravitational lensing analysis. At last, we describe the algorithm of numerical simulation of gravitational lensing. Those numerical simulations have played an important role to understand and model the statistical properties of observables in gravitational lensing analysis.
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