This is the 7259th most frequent Russian word.
возникший
"Возникший" - arisen; emerged.
In this sentence, 'возникшая' is used as a participle to describe a 'problem' that 'arose' during the discussion, indicating an action that occurred in the past relative to the main clause.
Проблема, возникшая в процессе обсуждения, потребовала немедленного решения.
The problem that arose during the discussion required an immediate solution.
Here, 'возникшая' functions similarly, describing an 'idea' that 'arose,' emphasizing the occurrence and impact of this action.
Возникшая идея показалась всем очень интересной.
The idea that arose seemed very interesting to everyone.
In this example, 'возникшую' is the accusative form of the participle, agreeing with 'ситуацию' (situation) in case, showing how the participle adjusts to other grammatical elements in the sentence.