Analyzer
Sentence analysis
11Spans
Sentence
Span Details
この
this; last (couple of years, etc.); these; past; you (as in "you liar")-> 此のpre-noun adjective
未解決問題
unresolved problem; open questionnoun
は
topic markergrammar
数学者
mathematiciannoun
たち
pluralizing suffix (people, animals)-> 達suffix
を
object markergrammar
長年
many years; a long timenoun, adverb
悩ま
worry; be troubled; agonize-> 悩むgodan verb
せ
causative auxiliary-> せる/させるgrammar
てき
change continuing toward the present point-> てくるgrammar
た。
past tense or completed actiongrammar