
theorem
  or3.<*0,0,0*> = 0 & or3.<*0,0,1*> = 1 & or3.<*0,1,0*> = 1 & or3.<*0,1,
1*> = 1 & or3.<*1,0,0*> = 1 & or3.<*1,0,1*> = 1 & or3.<*1,1,0*> = 1 & or3.<*1,1
  ,1*> = 1
proof
  thus or3.<*0,0,0*> = FALSE 'or' FALSE by FACIRC_1:def 7
    .= 0;
  thus or3.<*0,0,1*> = FALSE 'or' FALSE 'or' TRUE by FACIRC_1:def 7
    .= 1;
  thus or3.<*0,1,0*> = TRUE 'or' FALSE by FACIRC_1:def 7
    .= 1;
  thus or3.<*0,1,1*> = FALSE 'or' TRUE 'or' TRUE by FACIRC_1:def 7
    .= 1;
  thus or3.<*1,0,0*> = TRUE 'or' FALSE by FACIRC_1:def 7
    .= 1;
  thus or3.<*1,0,1*> = TRUE 'or' FALSE 'or' TRUE by FACIRC_1:def 7
    .= 1;
  thus or3.<*1,1,0*> = TRUE 'or' TRUE 'or' FALSE by FACIRC_1:def 7
    .= 1;
  thus or3.<*1,1,1*> = TRUE 'or' TRUE 'or' TRUE by FACIRC_1:def 7
    .= 1;
end;
