hw4.pdf - 21-300 F15 HW 4 Since its harder to word-process...

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21-300 F15 HW 4 Since it’s harder to word-process proofs, you may submit hand-written solutions to this homework subject to the following conditions: your homework is written in black ink on alternating lines, and is submitted as a legible 600dpi scan in PDF form. Note: When I say “prove” in this homework I mean produce a formal proof using the proof rules from class. Unless I specify hypotheses, your proof should have no hypotheses. Letters from the Greek alphabet ( α , β , γ , δ ) stand for arbitrary formulae. Your proofs should be labelled so that it is clear which proof rule was used at which stage. IMPORTANT: PLEASE EMAIL COMPLETED HOMEWORKS TO: [email protected]
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