%0 Journal Article %T Formula for the supremum distribution of a spectrally positive L¨¦vy process %A Zbigniew Michna %J Mathematics %D 2011 %I arXiv %X In this article we derive formula for probability $\Prob(\sup_{t\leq T} (X(t)-ct)>u)$ where $X=\{X(t)\}$ is a spectrally positive L\'evy process and $c\in\RL$. As an example we investigate the inverse Gaussian L\'evy process. %U http://arxiv.org/abs/1104.1976v6