Stable vector bundles and Hermitian operators

An internal combustion process in which fuel is twice combusted before leaving the system. Air is compressed in a low pressure cylinder with some of this compressed air being withdrawn and injected, with or without cooling, into a high pressure cylinder where it is further compressed and combusted with fuel in a highly fuel rich mixture. The exhaust gases from the high pressure cylinder are withdrawn from the latter and flowed into a reservoir chamber from which they are intermittently withdrawn and injected into the low pressure cylinder for mixture and combustion with the compressed air in the latter cylinder. The foregoing steps are repeated after the exhaust gases are purged from the low pressure cylinder.