Maybe do to my wording I came off wrong . As far as I know , math follows a set amount of logic , once you want to equate something as what is 11 equal to you start to get into a grey area of what is math to begin with ? By logic , I mean if we know 11 2 , then we can follow based on logic that 213 , otherwise we have no basis to understand each other and we go back into circular logic of what if 11 didn ' t exist . Back to your comment , if we didn ' t have mathematical logic then half the shit current society lives on i ' d wager more even the computer you will type this reply to is based on math and logical steps in programming . So does logic exist ? Yes , you ' re literally touching it in your hands . An aside , as far as chairs go , we need some understanding of physicsmath with some chemistry to realize why you can ' t move your hand through a chair .