Explanation

These pages provide background and context — the "why" behind MARPLE's design decisions. They're for readers who want to understand the reasoning, not just the mechanics.

• Why MARPLE Exists — design goals and philosophy
• How MARPLE Differs from Other APLs — feature comparison
• The Rank Operator — History and Significance — Whitney, Iverson, and SHARP APL
• Leading-Axis Theory — cells, frames, and why leading axis is the default
• Direct Definition — Why Not Tradfns — the case for dfns
• The Python Connection — backends, FFI, and the Pico target