"substacks" meaning in English

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          "ref": "2016, O. Mata-Gutiérrez, Frank Neumann, “Geometry of Moduli Stacks of (k,l)-stable vector bundles over an algebraic curve”, in arXiv:",
          "text": "We study the geometry of the moduli stack of vector bundles of fixed rank and degree over an algebraic curve by introducing a filtration made of open substacks build from (k,l)-stable vector bundles. (k,l)-stability was introduced by Narasimhan and Ramanan to study the geometry of the coarse moduli space of stable bundles.",
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  "word": "substacks"
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