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Step * of Lemma grp_car_inc

|(<ℤ+>↓hgrp)| ⊆r ℕ
BY
{ (D 0 THENA Auto) }

1
.....subterm..... T:t
1:n
1. x : |(<ℤ+>↓hgrp)|
⊢ x ∈ ℕ

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Latex:

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Latex:
|(<\mBbbZ{}+>\mdownarrow{}hgrp)|  \msubseteq{}r  \mBbbN{}


By

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Latex:
(D  0  THENA  Auto)

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