| No TPTP formula. May not be expressible in strict first order. | QoSontology.kif 994-994 | Operating system is a subclass of software system |
| No TPTP formula. May not be expressible in strict first order. | QoSontology.kif 1008-1008 | Solaris is a subclass of operating system |
| No TPTP formula. May not be expressible in strict first order. | QoSontology.kif 2159-2159 | Berkeley software distribution is a subclass of operating system |
| No TPTP formula. May not be expressible in strict first order. | Media.kif 1542-1542 | Mac OS is a subclass of operating system |
| No TPTP formula. May not be expressible in strict first order. | Media.kif 1547-1547 | Microsoft windows is a subclass of operating system |
| No TPTP formula. May not be expressible in strict first order. | Media.kif 1552-1552 | 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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