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fpwp];jt ghly;fs; http://www.thewayofsalvation.org/2010/12/blog-post_03.html
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By the def n. of *, m * mꞋ = m + mꞋ – mmꞋ
⟹ m + mꞋ – mmꞋ = 0
⟹ mꞋ (1 – m) = – m
⟹ mꞋ = is not an integer
⟹ mꞋ ∉ Z
⟹ Inverse element does not exist.