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## Main Question or Discussion Point

Hi,

As I read, A

[itex] f(t) = \{^{f(t), t\geq{0}}_{0, t<0}[/itex]

However what does it mean to have f(t) when t<0 ? ie. non-causal signal?

Is there any meaning when t<0 for any signal? In that sense all signals are causal. Isn't it?

Could u pls expain and point me correct direction.

Thanks

As I read, A

**Causal signal**is defined in electrical eng. context as[itex] f(t) = \{^{f(t), t\geq{0}}_{0, t<0}[/itex]

However what does it mean to have f(t) when t<0 ? ie. non-causal signal?

Is there any meaning when t<0 for any signal? In that sense all signals are causal. Isn't it?

Could u pls expain and point me correct direction.

Thanks