remark 18.34 The two ways an acceleration can be zero

open in the book · parts/03-classical-mechanics/01-kinematics.tex:1066 · p. 730

remark -- no derivation owed by its kind

Rests on

depends_on proposition 18.33 Intrinsic decomposition of the acceleration ¶
- depends_on definition 18.11 Acceleration ¶
  - depends_on definition 7.26 Derivative of a function at a point ¶
    - depends_on definition 7.16 Limit ¶
      - depends_on definition 7.2 Absolute value ¶
      - depends_on definition 7.9 Real function ¶
    - depends_on definition 7.9 Real function ¶ ↺
  - depends_on definition 18.10 Velocity ¶
    - depends_on definition 7.26 Derivative of a function at a point ¶ ↺
    - depends_on definition 18.9 Position ¶
      - depends_on definition 18.7 Frame of reference ¶
      - depends_on definition 18.3 Particle ¶
    - depends_on definition 13.9 Tangent vector to a curve ¶
      - depends_on definition 13.8 Curve ¶
- depends_on definition 13.14 Principal unit normal vector ¶
  - depends_on definition 13.13 Normal curvature vector of a curve ¶
    - depends_on definition 13.12 Unit tangent vector ¶
      - depends_on definition 13.11 Arc length ¶
      - depends_on definition 13.9 Tangent vector to a curve ¶ ↺
- depends_on definition 13.12 Unit tangent vector ¶ ↺
- proves proof ch:01-kinematics@proof-11 ¶

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`depends_on`	→	Intrinsic decomposition of the acceleration	declared	parts/03-classical-mechanics/01-kinematics.tex:1081