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We present a new method for the determination of the pion-pion scatteringlenght combination a0-a2, based on the study of the pi0-pi0 spectrum in K->pi+pi0 pi0 in the vicinity of the pi+ pi- threshold. The method requires a minimumof theoretical input, and is potentially very accurate.Comment: 8 pages, 2 figures -- corrected two typo

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Determination of the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>a</mml:mi><mml:mn>0</mml:mn></mml:msub><mml:mtext mathvariant="normal">−</mml:mtext><mml:msub><mml:mi>a</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:math>Pion Scattering Length from<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mi>K</mml:mi><mml:mo>+</mml:mo></mml:msup><mml:mo>→</mml:mo><mml:msup><mml:mi>π</mml:mi><mml:mo>+</mml:mo></mml:msup><…

Determination of thea0−a2Pion Scattering Length fromK+→π+<…