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Index Replication• Index tracking or benchmark replication is an strategy investmentaimed at mimicking the risk/return profile of a financial instrument.• For practical reasons, the strategy focuses on a reduced basket ofrepresentative securities.• This problem is also regarded as portfolio compression and it isintimately related to compressed sensing and l 1 -norm minimizationtechniques.• One example is the replication of an index, e.g., Hang Seng index,based on a reduced set of assets.Daniel P. Palomar 29