1. Ludwig Wittgenstein's "Tractatus Logico Philosophicus" (the extremism of the idea, the solemn (poetic?) tone that nevertheless emerges from the sentences of

1. Ludwig Wittgenstein's "Tractatus Logico Philosophicus" (the extremism of the idea, the solemn (poetic?) tone that nevertheless emerges from the sentences of such a rigorous work) 2. RMS reflections about morals in software programming (I may not wholly agree, but he taught me a whole new way of thinking about software) 3. Prolog declarative approach (instead of describing how to solve a problem, just describe the problem)