# Erlang ## Identification A concurrent functional programming language whose modules commonly use `.erl` and shared headers `.hrl`. ## Notebook evidence - [[Scanned_20260730-1946|Scanned_20260730-1946]], PDF page 20. ## Relationships and evidentiary boundary [[Software Supply-Chain Provenance]] · [[Interoperability]]. The notebook occurrence preserves a historical compatibility or software clue. It does not alone prove installation, use, ownership, provenance, or the exact identification of uncertain handwriting.