From daa2e4e74745aada56af88b70872286556a3994b Mon Sep 17 00:00:00 2001
From: Slavasil <subvia@proton.me>
Date: Mon, 23 Mar 2026 10:07:26 +0300
Subject: [PATCH] fix tabulation and gaps in expression.rb

---
 lib/ruby_algebra/expression.rb | 16 ++++++++++------
 1 file changed, 10 insertions(+), 6 deletions(-)

diff --git a/lib/ruby_algebra/expression.rb b/lib/ruby_algebra/expression.rb
index 44a0258..1448fa7 100644
--- a/lib/ruby_algebra/expression.rb
+++ b/lib/ruby_algebra/expression.rb
@@ -69,6 +69,7 @@ module RubyAlgebra
     def type
       :sub
     end
+
     def diff(v)
       Subtraction.new(@lhs.diff(v), @rhs.diff(v))
     end
@@ -114,13 +115,14 @@ module RubyAlgebra
     def op_assoc_type
       :left
     end
+
     def diff(v)
-    u_prime = @lhs.diff(v)
-    v_prime = @rhs.diff(v)
-    term1 = Multiplication.new(u_prime, @rhs)
-    term2 = Multiplication.new(@lhs, v_prime)
-    Addition.new(term1, term2)
-  end
+      u_prime = @lhs.diff(v)
+      v_prime = @rhs.diff(v)
+      term1 = Multiplication.new(u_prime, @rhs)
+      term2 = Multiplication.new(@lhs, v_prime)
+      Addition.new(term1, term2)
+    end
   end
 
   class Division < Multiplication
@@ -176,6 +178,7 @@ module RubyAlgebra
     def op_assoc_type
       :right
     end
+
     def diff(v)
       unless @exponent.is_a?(Constant)
         raise NotImplementedError, "Дифференцирование степени с неконстантным показателем не реализовано"
@@ -244,6 +247,7 @@ module RubyAlgebra
     def single_letter?
       @is_single_letter
     end
+
     def diff(v)
       @symbol == v ? Constant.new(1) : Constant.new(0)
     end