Thank you everybody very much, esp. Mojca! You almost saved my life! ) In spite of previously said, I don't like mixing Termes with Times New Roman, because e.g. "M" in math looks rather like bold "M" in the text. But I made a hack which works for me: { name = "timesi.ttf", vector = "tex-mi-txpx2", skewchar=0x7F }, I just replaced texgyretermes-italic.otf with timesi.ttf. Unfortunatelly, I cannot modify the first line too, because some greek letters are missed then, but I believe one day I could manage this ) mathematics.make_font ( "tx-math", { { name = "texgyretermes-regular.otf", features = "virtualmath", main = true }, { name = "rtxr.tfm", vector = "tex-mr" } , { name = "rtxmi.tfm", vector = "tex-mi-txpx1", skewchar=0x7F }, { name = "timesi.ttf", vector = "tex-mi-txpx2", skewchar=0x7F }, { name = "txsy.tfm", vector = "tex-sy", skewchar=0x30, parameters = true } , { name = "txex.tfm", vector = "tex-ex", extension = true } , { name = "txsya.tfm", vector = "tex-ma" }, { name = "txsyb.tfm", vector = "tex-mb" }, } ) Perfect for the moment! Thanks again! Best regards, Vyatcheslav