Is the filter $1/(1-s)$ anti-causal?

1. How do you know if a filter is causal?
2. What is an anti causal signal?
3. Which system is anti causal?
4. What is causal and anticausal?

How do you know if a filter is causal?

A filter is said to be causal if its output depends only on present and past inputs. Conversely, non-causal filters depend also on future inputs.

What is an anti causal signal?

Condition for Anti-Causal Signal: A signal which posses zero value for all positive value of time, but has amplitude which is greater then zero for all negative value of time, then the signal is known as anti-causal signal.

Which system is anti causal?

An acausal system is a system that is not a causal system, that is one that depends on some future input values and possibly on some input values from the past or present. This is in contrast to a causal system which depends only on current and/or past input values.

What is causal and anticausal?

A causal system is one whose output depends only on the present and the past inputs. A noncausal system's output depends on the future inputs. In a sense, a noncausal system is just the opposite of one that has memory.