"Fréchet surface" meaning in English

{
  "etymology_text": "Named after the French mathematician Maurice Fréchet.",
  "forms": [
    {
      "form": "Fréchet surfaces",
      "tags": [
        "plural"
      ]
    }
  ],
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      "expansion": "Fréchet surface (plural Fréchet surfaces)",
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
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      ],
      "glosses": [
        "An equivalence class of parametrized surfaces in a metric space."
      ],
      "id": "en-Fréchet_surface-en-noun-Um8Az9PG",
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          "mathematics",
          "mathematics"
        ],
        [
          "equivalence class",
          "equivalence class"
        ],
        [
          "parametrized",
          "parametrized"
        ],
        [
          "surface",
          "surface"
        ],
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          "metric space",
          "metric space"
        ]
      ],
      "raw_glosses": [
        "(mathematics) An equivalence class of parametrized surfaces in a metric space."
      ],
      "topics": [
        "mathematics",
        "sciences"
      ],
      "wikipedia": [
        "Fréchet surface",
        "Maurice Fréchet"
      ]
    }
  ],
  "word": "Fréchet surface"
}

{
  "etymology_text": "Named after the French mathematician Maurice Fréchet.",
  "forms": [
    {
      "form": "Fréchet surfaces",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "Fréchet surface (plural Fréchet surfaces)",
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    }
  ],
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  "lang_code": "en",
  "pos": "noun",
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      "glosses": [
        "An equivalence class of parametrized surfaces in a metric space."
      ],
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          "equivalence class",
          "equivalence class"
        ],
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          "parametrized"
        ],
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          "surface",
          "surface"
        ],
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          "metric space",
          "metric space"
        ]
      ],
      "raw_glosses": [
        "(mathematics) An equivalence class of parametrized surfaces in a metric space."
      ],
      "topics": [
        "mathematics",
        "sciences"
      ],
      "wikipedia": [
        "Fréchet surface",
        "Maurice Fréchet"
      ]
    }
  ],
  "word": "Fréchet surface"
}