... n)notequivalenttozero, and f, g, h, w are decreasing both in the first variable a nd the second variable, a is de creasing in the first va riable, and b is decreasing in the second variable, a, b aredefined as in ... variable and the second variable, a is decreasing in the first variable, and b is decreasing in the second variable, a, b are defined as in Theo-rem 2.2, and L is defined as in Theorem 2.8. p, l are ... variable, while decreasing in the secondvariable”, “f(m, n)is nondecreasing in the first variable a nd decreasing in the secondvariable”,and“b is decreasing in the second variable” in...