I Ruined My Puffco By Cleaning It. Heres How To Avoid The Not Detected Error.

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I Ruined My Puffco By Cleaning It. Heres How To Avoid The Not Detected Error.

Is there a formal proof for $(-1) \\times (-1) = 1$? It's a fundamental formula not only in arithmetic but also in the whole of math. Is there a proof for it or is it just assumed?

My Puffco Dab Station : r/puffco

My puffco family : r/puffco