valid is a word used for an argument ,thus you are implying that a mathematical proof is a valid argument?You need to ask someone who has expertise in the area that the proof comes from if the proof is valid or not. This forum should be helpful in making that determination.
yesvalid is a word used for an argument ,thus you are implying that a mathematical proof is a valid argument?
Knowing that an argument has a series of statements called premisses and a statement called conclusion,in the proof of
0a=(0+0)a is a conclusion and not a premiss0a = (0+0)a = 0a +0a
=> 0 = 0a by the cancellation law.
No, it's the result of the reverse of the distributive operation on 0a.0a=(0+0)a is a conclusion and not a premiss