證明
證明者，辨一命題之正誤也。
理之如水也，易為下。水下流則失勢，上流則理不容。充分者，勢高也，必要者，勢下也，充分必要者，勢等也。是故論理如治水。條件者，水之來也，結論者，流之往也，證明者，吾見其流而至也。
然數、理、法之證明各異耳。數者，始乎公理，以理則逐步論之。理者，按法則測之，若無反證，即證之耳。法者，今泰西之法，須無可疑之處，方為成耳。
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