Throughout this video, we will see how a recursive formula calculates each term based on the previous term’s value, so it takes a bit more effort to generate the sequence. We want to remind ourselves of some important sequences and summations from Precalculus, such as Arithmetic and Geometric sequences and series, that will help us discover these patterns. And it’s in these patterns that we can discover the properties of recursively defined and explicitly defined sequences. What we will notice is that patterns start to pop-up as we write out terms of our sequences. All this means is that each term in the sequence can be calculated directly, without knowing the previous term’s value. So now, let’s turn our attention to defining sequence explicitly or generally. Isn’t it amazing to think that math can be observed all around us?īut, sometimes using a recursive formula can be a bit tedious, as we continually must rely on the preceding terms in order to generate the next. In fact, the flowering of a sunflower, the shape of galaxies and hurricanes, the arrangements of leaves on plant stems, and even molecular DNA all follow the Fibonacci sequence which when each number in the sequence is drawn as a rectangular width creates a spiral. For example, 13 is the sum of 5 and 8 which are the two preceding terms. Notice that each number in the sequence is the sum of the two numbers that precede it. And the most classic recursive formula is the Fibonacci sequence. Zeno’s paradox questions the conclusion of a geometric sequence, which paradoxically questions Atalanta’s ability to complete her walk to the end of the path! Our brain battles the fact that the sequence is infinite against our observable experience – of course Atalanta can walk to the end of the path! A related paradox to ponder: when would you say that the perimeter of a nested triangle in Problem #24 is equal to zero? This question might seem absurd, just like Zeno’s Paradox! Use your own thoughts to contemplate the question and debate your conclusion with a logical argument.Staircase Analogy Recursive Formulas For SequencesĪlright, so as we’ve just noted, a recursive sequence is a sequence in which terms are defined using one or more previous terms along with an initial condition. Before traveling a quarter, she must travel one-eighth before an eighth, one-sixteenth and so on. Before she can get halfway there, she must get a quarter of the way there. Before she can get there, she must get halfway there. Suppose Atalanta wishes to walk to the end of a path. Zeno’s Paradox is an observation which seems absurd, yet it starts sounding logically acceptable in relation to geometric sequences! Zeno’s Paradox reads:.Without considering any other changes to the reservoir’s volume, how much water will have evaporated over a one-year period? Suppose a reservoir contains an average of \(1.4\) billion gallons of water and loses water due to evaporation at a rate of \(2\%\) per month. Changes can occur to any water supply due to inflow and outflow, but evaporation is one of the factors of water depletion. Reservoirs can be the source of water supply for millions of people.
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