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, :
κ
, ∈¥ , , ,
λ
1
,
λ
. .
1 1 1 1 1 κ
+ + + ... = κ ⋅ = (1)
λ λ λ
1442443 λ λ λ
1
κ το πλ θος
λ
,
:
1⋅1 = 1 ⇔
ν µ
⋅ = 1 ⇔ (1)
ν µ
1 1
ν ⋅ ⋅ µ ⋅ = 1 ⇔ (αντιµεταθετικ & προσεταιριστικ )
ν µ
1 1 
ν ⋅µ  ⋅  =1⇔
ν µ 
1 1 1
⋅ = (2)
ν µ ν ⋅µ
κ λ 1 1 1 κ ⋅λ
⋅ = κ ⋅ ⋅λ ⋅ = κ ⋅λ ⋅ = . .δ .
, ν µ (1) ν µ (2) ν ⋅ µ (1) ν ⋅ µ
, –
( ) .
∈¥
1 1
⋅ .
ν ν
1
,
» , . ,
(α o β )−1 = β −1 o α −1 , G