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I saw an equation as the following one. enter image description here

  • What is the meaning of the symbol looking like an inverse T?
  • How about the symbol "^"?

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The following is the context: enter image description here enter image description here

This is the source:

On Updating Problems in Latent Semantic Indexing, SIAM Journal on Scientific Computing - 21(2):pp. 782-791;

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