ISO 80000-10:2019 is a standard by the International Organization for Standardization (ISO) that specifies mathematical symbols and their meanings, along with verbal equivalents and applications. It's primarily aimed at the natural sciences and technology but applies to other fields where mathematics is used. "PDF" in the context likely refers to the file format (Portable Document Format), which is standardized as ISO 32000. "Amd1" likely refers to an amendment to the standard, indicating a modification or update to the 2019 version.
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