Math & Science ⇒ Missing delimiter - error

[koncek]

Hi,
my problem is that in output log i get the error:

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! Missing delimiter (. inserted).
<to be read again> 
                   {
l.45 	F_d = 	\left{
                    \begin{array}{ l l }

and i don't know what do about it. Can anyone help me with this s**t?

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\begin{equation}
        \label{eq:zastepczy}
        F_d =   \left{ \begin{array}{ l l }
                                C_{sa}\cdot \left (v+v_g \right ) & \quad \left (v+v_g \right )\cdot v > 0 \\
                                0 & \quad \left (v+v_g \right )\cdot v < 0 \\
                        \end{array}
                \right.
\end{equation}

i know there was many topics like mine, but i checked some of them and it didn't help me solve my problem...
thanks,
koncek

[Boersma]

You have

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\left { 

instead of (remark the backslash):

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\left \{