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The Supernova Cosmology Project has discovered over twenty-eight supernovae(SNe) at 0.35 <z < 0.65 in an ongoing program that uses Type Ia SNe ashigh-redshift distance indicators. Here we present measurements of the ratiobetween the locally observed and global Hubble constants, H_0^L/H_0^G, based onthe first 7 SNe of this high-redshift data set compared with 18 SNe at z <= 0.1from the Calan/Tololo survey. If Omega_M <= 1, then light-curve-width correctedSN magnitudes yield H_0^L/H_0^G < 1.10 (95% confidence level) in both aLambda=0 and a flat universe. The analysis using the SNe Ia as standard candleswithout a light-curve-width correction yields similar results. These resultsrule out the hypothesis that the discrepant ages of the Universe derived fromglobular clusters and recent measurements of the Hubble constant areattributable to a locally underdense bubble. Using theCepheid-distance-calibrated absolute magnitudes for SNe Ia of Sandage (1996},we can also measure the global Hubble constant, H_0^G. If Omega_M >= 0.2, wefind that H_0^G < 70 km/s/Mpc in a Lambda=0 universe and H_0^G < 78 km/s/Mpc ina flat universe, correcting the distant and local SN apparent magnitudes forlight curve width. Lower results for H_0^G are obtained if the magnitudes arenot width corrected.

Implications for the Hubble Constant from the First Seven Supernovae at [CLC][ITAL]z[/ITAL][/CLC] ≥ 0.35