
theorem
  or3a.<*0,0,0*> = 1 & or3a.<*0,0,1*> = 1 & or3a.<*0,1,0*> = 1 & or3a.<*
  0,1,1*> = 1 & or3a.<*1,0,0*> = 0 & or3a.<*1,0,1*> = 1 & or3a.<*1,1,0*> = 1 &
  or3a.<*1,1,1*> = 1
proof
  thus or3a.<*0,0,0*> = 'not' FALSE 'or' FALSE by Def15
    .= 1;
  thus or3a.<*0,0,1*> = 'not' FALSE 'or' FALSE 'or' TRUE by Def15
    .= 1;
  thus or3a.<*0,1,0*> = 'not' FALSE 'or' TRUE 'or' FALSE by Def15
    .= 1;
  thus or3a.<*0,1,1*> = 'not' FALSE 'or' TRUE 'or' TRUE by Def15
    .= 1;
  thus or3a.<*1,0,0*> = 'not' TRUE 'or' FALSE by Def15
    .= 0;
  thus or3a.<*1,0,1*> = 'not' TRUE 'or' FALSE 'or' TRUE by Def15
    .= 1;
  thus or3a.<*1,1,0*> = TRUE 'or' FALSE by Def15
    .= 1;
  thus or3a.<*1,1,1*> = 'not' TRUE 'or' TRUE 'or' TRUE by Def15
    .= 1;
end;
