"Это известная проблема."
Translation:It is a well-known problem.
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эта известная проблема="this well-known problem", это="it is" (это - человек) or neuter "this" (это имя) or indefinite "it" (я вижу это)
olimo wrote an excellent guide for when to use это / эта / этот / эти: https://forum.duolingo.com/comment/11536858
surely saying "it's a common problem" is more realistic than saying "it's a well-known/famous
A problem can be very common, but almost unknown e.g. a fault in a model of washing machine that has not yet been recalled.
The same. If it really makes different with or without "-"? For me as not native English - it just doesn't seem as incorrect without "-"
When two or more words combine to form an adjective, there should be a hyphen between each word. Here "well-known" is describing "problem," so the two words are combined with a hyphen. (But unfortunately it's pretty common for native English speakers to forget this.)
The meaning is "important problem"? I'm not a native speaker of English but "well-known problem" sounds quite weird to me.
To say "well-known problem" does sound kind of strange, but it could be possible under certain circumstances. "Well-known issue" is a better collocation in English. I think the translation here is simply showing that the Russian word известный can be translated as well-known.
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This is perfectly natural to me (Hiberno- and British-English speaker), but that may be because I am a mathematician! There are many famous problems, or well-known problems, in mathematics and theoretical physics, some of which have $1,000,000 prizes!
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Being a computer scientist, I agree:
https://en.wikipedia.org/wiki/NP-completeness
"The list below contains some well-known problems that are NP-complete when expressed as decision problems."
I take notice though of the native speakers comment that "Well-known issue" might be more natural when the problems are not mathematical in nature but a "real world issue".
Do you think "well-known problem" would be a phrasing used by better speakers? Simple folk might say "everyone knows it" :p
Does the word "извесная" have anything to see with the word "извините" ? 'cause they look very much alike ^^
Известная and извините look alike only because they have the same prefix из- and the same first root letter в. Taking the root we have "вест" and "вин" which are clearly different. Весть=a piece of news, вина=guilt.
wiktionary. I'm not sure on which meaning this word is based, I guess, it's about completeness, it's buried in the language history.
It's like there is a word "go on" and you ask "what does on indicate?".
Look at the top comments here and especially at this article https://forum.duolingo.com/comment/11536858
I put "This is a well-known problem." and got it wrong. The correction said, "It is a ..." Why was this wrong?
Because i didnt type a - between well know i have failed this one a second time