A -algebra is a Banach algebra with an antiautomorphic involution which satisfies
(1)
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(2)
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(3)
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(4)
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where is the complex conjugate of , and whose norm satisfies
(5)
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A -algebra is a Banach algebra with an antiautomorphic involution which satisfies
(1)
| |||
(2)
| |||
(3)
| |||
(4)
|
where is the complex conjugate of , and whose norm satisfies
(5)
|
Weisstein, Eric W. "C^*-Algebra." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/C-Star-Algebra.html