"sublaplacian" meaning in English

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  "etymology_text": "sub- + Laplacian",
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      "form": "sublaplacians",
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        {
          "ref": "2016, Marius Mantoiu, “Spectral Analysis for Perturbed Operators on Carnot Groups”, in arXiv",
          "text": "Let #x5C;mathsfG be a Carnot group of homogeneous dimension M and #x5C;Delta its horizontal sublaplacian.",
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      "topics": [
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  "word": "sublaplacian"
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  "etymology_text": "sub- + Laplacian",
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