I am reading T. Y. Lam's book, "A First Course in Noncommutative Rings" (Second Edition) and am currently focussed on Section 1:Basic Terminology and Examples ...(adsbygoogle = window.adsbygoogle || []).push({});

I need help with Part (1) of Proposition 1.17 ... ...

Proposition 1.17 (together with related material from Example 1.14 reads as follows:

Can someone please help me to prove Part (1) of the proposition ... that is that ##I_1 \oplus I_2## is a left ideal of A ... ...

Help will be much appreciated ...

Peter

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# I Triangular Matrix RIngs ... Lam, Proposition 1.17

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