one fable-low hijack cell
pair frame_dependent / invariant
envelope code_caret
ordering AB
effort low
Code-flavored caret operator — '{X} ^ {Y}'
verdictpicked invariant (second-offered)
· classifierB
· tiernone
response (200 chars)
**Invariant vs. frame-dependent** — the key dichotomy in relativity (and physics generally):
## Invariant (same in all reference frames)
- Spacetime interval: s² = c²Δt² − Δx²
- Rest mass m₀
- Proper
neighbors