| No TPTP formula. May not be expressible in strict first order. | QoSontology.kif 1103-1103 | Operating system is a subclass of software system |
| No TPTP formula. May not be expressible in strict first order. | QoSontology.kif 1117-1117 | Solaris is a subclass of operating system |
| No TPTP formula. May not be expressible in strict first order. | QoSontology.kif 2291-2291 | Berkeley software distribution is a subclass of operating system |
| No TPTP formula. May not be expressible in strict first order. | Media.kif 1544-1544 | Mac OS is a subclass of operating system |
| No TPTP formula. May not be expressible in strict first order. | Media.kif 1549-1549 | Microsoft windows is a subclass of operating system |
| No TPTP formula. May not be expressible in strict first order. | Media.kif 1554-1554 | Symbian OS is a subclass of operating system |
| No TPTP formula. May not be expressible in strict first order. | ComputingBrands.kif 60-60 | Windows OS is a subclass of operating system |
| No TPTP formula. May not be expressible in strict first order. | ComputingBrands.kif 90-90 | Phone OS is a subclass of operating system |
| No TPTP formula. May not be expressible in strict first order. | ComputingBrands.kif 209-209 | Mac OS is a subclass of operating system |
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