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150 CHAPTER 6 Fact models Corresponding fact types are available for simple arithmetic attributes: F66. F67. F68. F69. F70. simple simple simple simple simple arithmetic arithmetic arithmetic arithmetic arithmetic attribute attribute attribute attribute attribute is is is is is less than quantity more than quantity no less than quantity no more than quantity equal to quantity In each of these, quantity refers to either a simple arithmetic attribute or a quantity literal. There are also alternative forms for F66, F68, and F69: F71. simple arithmetic attribute is fewer than quantity F72. simple arithmetic attribute is at least quantity F73. simple arithmetic attribute is at most quantity Fact types are also available for comparing time periods with each other and time points with time periods: F74. F75. F76. time time time period attribute overlaps time period period attribute is earlier than time period period attribute is later than time period