文摘
A. Gray introduced 5001138&_mathId=si1.gif&_user=111111111&_pii=S0926224515001138&_rdoc=1&_issn=09262245&md5=819016415d5d3076a2439fd7e7c5d41d" title="Click to view the MathML source">A-metrics and 5001138&_mathId=si11.gif&_user=111111111&_pii=S0926224515001138&_rdoc=1&_issn=09262245&md5=1f5d8ab7ee019a444c06bc2cef321198" title="Click to view the MathML source">B-metrics, which are natural generalizations of Einstein metrics. In this paper, homogeneous 5001138&_mathId=si1.gif&_user=111111111&_pii=S0926224515001138&_rdoc=1&_issn=09262245&md5=819016415d5d3076a2439fd7e7c5d41d" title="Click to view the MathML source">A-metrics and 5001138&_mathId=si11.gif&_user=111111111&_pii=S0926224515001138&_rdoc=1&_issn=09262245&md5=1f5d8ab7ee019a444c06bc2cef321198" title="Click to view the MathML source">B-metrics on spheres and projective spaces are classified.