Your defintion of a causal system seems accurate and understandable, as are your examples. You need to add a formal definition of non-causal though, right now it's just implicit based on your example. -Ryan Scott
Your Causal System definition is easy to read and understand. I also liked how you pointed out that all memoryless systems are causal. - Max Paganini
Your definitions are easy to read and straight and to the point. In the first part I particularly liked the deduction you made about memoryless systems. In the second I liked how you pointed out that a non-causal system can also be dependent on past or present values of t. It helps make your definitions more exact and leaves out any speculation. You also have very large biceps. - Phil Cannon
I thought your definitions were clear and easy to understand. Your examples also helped quite a bit. I would give you an A+, but I am not your professor. Sorry, dude. -Virgil Hsieh
