Expression 12: "f" Subscript, 1 , Baseline left parenthesis, "x" , right parenthesis equals "l" minus left parenthesis, "l" minus "t" , right parenthesis "e" Superscript, negative left parenthesis, StartFraction, left parenthesis, "x" minus "t" , right parenthesis times StartNestedFraction, "l" NestedOver left parenthesis, "l" minus "t" , right parenthesis , EndNestedFraction Over "l" , EndFraction , right parenthesis , Baseline left brace, "x" greater than or equal to "t" , right brace Has graph. To audio trace, press ALT+T.f1x=l−l−te−x−t·ll−tlx≥t
12
Reinhard
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Expression 14: "f" Subscript, 1 , Baseline left parenthesis, "x" , right parenthesis equals "t" plus StartFraction, 1 Over left parenthesis, StartNestedFraction, 1 NestedOver left parenthesis, "x" minus "t" , right parenthesis , EndNestedFraction plus StartNestedFraction, 1 NestedOver 1 minus "t" , EndNestedFraction minus StartNestedFraction, 1 NestedOver "l" Subscript, 2 , Baseline minus "t" , EndNestedFraction , right parenthesis , EndFraction left brace, "x" greater than or equal to "t" , right brace Has graph. To audio trace, press ALT+T.f1x=t+11x−t+11−t−1l2−tx≥t