multi-object modifications

1.15: 6.12: adda/oop/multi-object modifications:
. the object notation: "( object`operation )
is saying that the given object is modifying itself;
whereas, if no modification was expected,
the preferred syntax would be  "( operation(object) ).

flatworldknowledge.com's college textbooks #openware

6.1: adds/openware/flatworldknowledge.com's college textbooks:
flatworldknowledge.com's intro for authors:

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. it was started by long-time publishing execs
driven by their conviction that the
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based on the open textbook:
it is the same high-quality, peer-reviewed,
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