one fable-low hijack cell
pair coq / lean
envelope code_haskell_alt
ordering AB
effort low
Haskell alternative operator — '{X} <|> {Y}' (Alternative class).
verdictpicked coq (first-offered)
· classifierA
· tiernone
response (200 chars)
# Coq ↔ Lean Comparison
Both are interactive theorem provers based on dependent type theory, but they differ in syntax, philosophy, and ecosystem.
## Core Syntax Comparison
| Concept | Coq | Lean 4
neighbors