Lakatos found that many research programmes coexisted. Each had a hard core of theories immune to revision, surrounded by a protective belt of malleable theories., ch 4 "Post-positivist philosophy of science", subch "Lakatosian research programmes", pp 60-63 A research programme vies against others to be most progressive. Extending the research programme 's theories into new domains is theoretical progress, and experimentally corroborating such is empirical progress, always refusing falsification of the research programme 's hard core. A research programme might degenerate—lose progressiveness—but later return to progressiveness.
Lakatos found that many research programs coexisted. Each had a hard core of theories immune to revision, surrounded by a protective belt of malleable theories., ch 4 "Post-positivist philosophy of science", subch "Lakatosian research programmes", pp 60-63 A research programme vies against others to be most progressive. Extending the research program 's theories into new domains is theoretical progress, and experimentally corroborating such is empirical progress, always refusing falsification of the research program 's hard core. A research program might degenerate—lose progressiveness—but later return to progressiveness.
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