Hp 49g+ User Manual download pdf (Page 84)

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Press ‚O to activate the Equation Writer. Then press ‚½to enter

the summation sign. Notice that the sign, when entered into the Equation

Writer screen, provides input locations for the index of the summation as well

as for the quantity being summed. To fill these input locations, use the

following keystrokes:

~„k™1™„è™1/~„kQ2

The resulting screen is:

To see the corresponding expression in the line editor, press ‚— and the

A soft menu key, to show:

This expression shows the general form of a summation typed directly in the

stack or line editor:

Σ(index = starting_value, ending_value, summation expression)

Press ` to return to the Equation Writer. The resulting screen shows the

value of the summation,

To recover the unevaluated summation use ‚¯. To evaluate the

summation again, you can use the D soft menu key. This shows again that

∑

∞

You can use the Equation Writer to prove that

+∞=

∑

∞

This summation (representing an infinite series) is said to diverge.

Double summations are also possible, for example:

1 2 ... 79 80 81 82 83 84 85 86 87 88 89 ... 861 862

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Hp 49g+ User Manual Page 84

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