>>> 1.1+2.2 == 3.3 False Requesting the database with some SQL inner join should get you less lines than both tables ? No ! It gets you a deadlock exception be

>>> 1.1+2.2 == 3.3 False Requesting the database with some SQL inner join should get you less lines than both tables ? No ! It gets you a deadlock exception because some other program locks you... Doing a DNS query to get IP address of an host ? Getting an IP ? Yes ? Everything ok ? No because some bit flipped somewhere and caused the result to be the IP address of foogle.com So yes you are using maths but you are not doing maths.