Signals and systems/System properties


 * Systems with memory/without memory
 * Casual systems
 * Stable systems
 * Time invariance in systems
 * Linearity in systems

Memory in systems
When no need to maintain previous values for getting new results - this is memoryless system

Casuality of systems
Output depends only from past and current inputs, but no need to know future values.

Stable system
For each bounded inputs - bounded outputs. When finite inputs then finite outputs.

Time invariance
$$x(t)\to y(t)$$ and $$x((t-n))\to y((t-n))$$ Expected results when time is changing by delta.

Linearity systems
When $$x_1\to y_1$$ then $$x_2\to y_2$$ Expected results for all reasonable inputs.