SYRIZA Leader Rejects 'Barbaric' Austerity
Alexis Tsipras, 38, head of the Coalition of the Radical Left, or SYRIZA, formally received the mandate to form a coalition government from President Karolos Papoulias at their meeting in Athens on Tuesday.
Conservative New Democracy leader Antonis Samaras, whose party was sharply reduced in Sunday's election, abandoned his bid to form a coalition government on Monday after only six hours of talks.
The mandate is valid for 72 hours.
Voters failed to give any party a majority, plunging Greece into more uncertainty.
The result is part of a wave of anti-austerity feeling that is building momentum in Europe.