Rootless A — m7

♭3 – 5 – ♭7 – 9

Prove it — just do the practice exercise.
Dm7 Rootless A
F (♭3)A (5)C (♭7)E (9)
Rootless A for Minor 7:

• ♭3 – 5 – ♭7 – 9

The minor 3rd on the bottom defines the minor character even without the root.

Example: Dm7 RL-A = F + A + C + E