Terminology
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Weight - The proportion of a pool's total value which a token represents.
Denormalized Weight - The denormalized weight value. Solidity does not have good handling for fixed point numbers, so the contracts uses denormalized values to represent token weights.
Target Weight - The weight that a pool's controller has determined a token should eventually have, and which swaps will move the token towards. Used interchangeably with "desired weight".
Initialized - Used to describe whether a pool owns a sufficient amount of a token to cover the minimum weight.
Note: this is distinct from "pool initialization", which acts in the place of a constructor.
Portfolio - The basket of assets held by a pool.
Portfolio Composition - The makeup of a portfolio, particularly with regard to the weights of each token.
Underlying Tokens - The tokens held by a pool.
Index Tokens - Liquidity provider tokens for a pool. These represent ownership of the underlying assets in a pool.
Rebalance - The process of changing the composition of an index pool.
Re-weigh - The process of re-assigning the target weights of the current desired tokens in an index pool.
Re-index - The process of re-assigning both the desired tokens in an index pool and their target weights.