---

Step * of Lemma hd-wf-not-null

∀[A:Type]. ∀[l:A List].  hd(l) ∈ A supposing ¬↑null(l)
BY
{ Auto }

---

Latex:

---

Latex:
\mforall{}[A:Type].  \mforall{}[l:A  List].    hd(l)  \mmember{}  A  supposing  \mneg{}\muparrow{}null(l)


By

---

Latex:
Auto

---

Home Index