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恒等 こうとう作用 さよう素 そでした
kōtōsa yōsodeshita

敬
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Noun
, 
Desu Copula

The polite past form of 恒等作用素

1. was an identity operator.

Past/Perfective
, 
Polite
, 
Mathematics

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恒等作用素でした

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