What "double bracket" means?

Asked Aug 06 '13 at 23:27

Active Aug 07 '13 at 00:02

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What does this symbol mean? Please i need help: enter image description here

Its the symbol just before "$H^{t-1}$". Thanks for help

edited Aug 06 '13 at 23:31

Sujaan Kunalan

asked Aug 06 '13 at 23:27

Marx Guimarães

0 Answers0