Listen to this morning's class, "The 'Written Words' of Halakhah (1)," here.
Follow along with the sources here.
For further research:
We mentioned several past classes while discussing how to process "retracted opinions":
1) Listen to the class that touched on HaRambam's opinion regarding kidushei kesef here.
2) Listen to the class regarding birkat "ha-noten la-ya'ef ko'ah" here.
3) Listen to the class regarding riding a bicycle on Shabbat here.
4) Listen to the class regarding halav Yisrael here.