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The topic is the covariance of non-generic parameters in seven OOP languages: C++, Eiffel, Java, C#, Scala, Kotlin, Swift (the order is from oldest to youngest).

ARM ISA processors are no longer used “only” for mobile phones and tablets, but also for server computers (even supercomputers) and laptops/desktops.
Apple has also switched from Intel to ARM on Macintosh computers.

The hotel housekeeping is one of the key departments in the organizational structure of the hotel. Hotel room represents a temporary home for every guest, and the home is a place where everyone should feel safe and comfortable. This has particularly came to the fore now, during the global pandemic.

After an interesting concept of a mathematical game in which it is necessary to determine: “What is the shortest path between an ant and a drop of honey?”, the author encounters more mathematical secrets…

The topic is the covariance of non-generic parameters in the languages PL/SQL, C ++, Eiffel, Java, Scala, Kotlin (except PL/SQL, the order of other languages is the order of their occurrence).

ARM ISA processors are no longer used “only” for mobile phones and tablets, but also for server computers and laptops / desktops.

Will global tourism grow again after the consequences of the 2020 pandemic?

This is an extended version of the lecture about testing concurrent transactions in the database using Java parallel programming.

The paper contains a review on the topic of using appropriate architecture and potential problems and issues when creating web business applications.

The paper contains a review of functional and logic programming, and to get some ideas from functional programming may be applied to database programming.