The notation "+ h.c." is used as a shorthand to omit writing out half of the terms actually present in an expression.
Sources
- + h.c. (en.wikipedia.org)
- https://www.researchgate.net/post/What_is_the_hc_term_that_comes_along_with_hopping_term_t_in_the_single_band_Hubbard_model_of_RVB (researchgate.net)
- https://www.physicsforums.com/threads/meaning-of-h-c-in-lagrangians-elsewhere.454071/ (physicsforums.com)
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