essential singularity

isolated singularity that is neither removable nor a pole

en-GB/ɪˈsɛnʃl ˌsɪŋɡjʊˈlæɹɪtɪ/
en-US/iˈsɛnʃəl ˌsɪŋjʊˈlæɹiti/

カテゴリ：

isolated singularity