| Subject | English | Icelandic |
| math. | Bartlett's matrix-identity | Bartlett matrix-auðkenni |
| math. | Jordan's identity | Jordan's sjálfsmynd |
| comp., MS | online identity | netauðkenni (A single set of sign-in credentials (typically, e-mail address and password) that is used to access the services provided by an online service provider (OSP)) |
| math. | Pollaczek-Spitzer identity | Pollaczek-Spitzer sjálfsmynd |
| math. | Spitzer's identity | Spitzer er sjálfsmynd |
| math. | Wald's fundamental identity | grundvallaratriði Wald er sjálfsmynd |