Before proceeding, here are standard examples of semialgebras. Examples: why & € 5,₁ = ? φες: Eise! (a) Let S = R, and suppose S₁ consists of intervals including Ø, the emp 2 set: S₁ = {(a,b] : -∞0 ≤ a ≤ b ≤ ∞0}. If I1, I₂ € S₁, then I₁I₂ is an interval and in S₁ and if I € S₁, then IC is union of disjoint intervals. I

Advanced Engineering Mathematics
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ISBN:9780470458365
Author:Erwin Kreyszig
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Chapter2: Second-order Linear Odes
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Before proceeding, here are standard examples of semialgebras.
Examples: why
& € 5,₁ = ?
(a) Let S = R, and suppose S₁ consists of intervals including Ø, the empty
set:
S₁ = {(a, b]: -∞0 ≤a ≤ b ≤∞0}.
If I₁, I2 € S₁, then 1₁ 12 is an interval and in S₁ and if I € S₁, then I is a
union of disjoint intervals.
I
0
1
FIGURE 2.1 Intervals
Exercise
Transcribed Image Text:Before proceeding, here are standard examples of semialgebras. Examples: why & € 5,₁ = ? (a) Let S = R, and suppose S₁ consists of intervals including Ø, the empty set: S₁ = {(a, b]: -∞0 ≤a ≤ b ≤∞0}. If I₁, I2 € S₁, then 1₁ 12 is an interval and in S₁ and if I € S₁, then I is a union of disjoint intervals. I 0 1 FIGURE 2.1 Intervals Exercise
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